A uniform disk, a thin hoop, and a uniform sphere, all with the same mass and same outer radius, are each free to rotate about a fixed axis through its center.  Assume the hoop is connected to the rotation axis by light spokes.  With the objects starting from rest, identical forces are simultaneously applied to the rims, as shown.  Rank the objects according to their kinetic energies after a given time $t$, from least to greatest.

[asy]
size(225);
pen dps = linewidth(0.7) + fontsize(10); defaultpen(dps);
filldraw(circle((0,0),1),gray(.7));
draw((0,-1)--(2,-1),EndArrow);
label("$\vec{F}$",(1, -1),S);
label("Disk",(-1,0),W);
filldraw(circle((5,0),1),gray(.7));
filldraw(circle((5,0),0.75),white);
draw((5,-1)--(7,-1),EndArrow);
label("$\vec{F}$",(6, -1),S);
label("Hoop",(6,0),E);
filldraw(circle((10,0),1),gray(.5));
draw((10,-1)--(12,-1),EndArrow);
label("$\vec{F}$",(11, -1),S);
label("Sphere",(11,0),E);
[/asy]

$ \textbf{(A)} \ \text{disk, hoop, sphere}$

$\textbf{(B)}\ \text{sphere, disk, hoop}$

$\textbf{(C)}\ \text{hoop, sphere, disk}$

$\textbf{(D)}\ \text{disk, sphere, hoop}$

$\textbf{(E)}\ \text{hoop, disk, sphere} $
To solve this problem, we need to understand the relationship between the moment of inertia, torque, angular acceleration, and kinetic energy for each of the objects: the disk, the hoop, and the sphere.

1. **Moment of Inertia**:
   - For a uniform disk of mass \( M \) and radius \( R \), the moment of inertia about its center is:
     \[
     I_{\text{disk}} = \frac{1}{2} M R^2
     \]
   - For a thin hoop of mass \( M \) and radius \( R \), the moment of inertia about its center is:
     \[
     I_{\text{hoop}} = M R^2
     \]
   - For a uniform sphere of mass \( M \) and radius \( R \), the moment of inertia about its center is:
     \[
     I_{\text{sphere}} = \frac{2}{5} M R^2
     \]

2. **Torque and Angular Acceleration**:
   - The torque \( \tau \) applied to each object is given by:
     \[
     \tau = F \cdot R
     \]
   - The angular acceleration \( \alpha \) is related to the torque and the moment of inertia by:
     \[
     \alpha = \frac{\tau}{I}
     \]
   - Therefore, for each object:
     \[
     \alpha_{\text{disk}} = \frac{F \cdot R}{\frac{1}{2} M R^2} = \frac{2F}{M R}
     \]
     \[
     \alpha_{\text{hoop}} = \frac{F \cdot R}{M R^2} = \frac{F}{M R}
     \]
     \[
     \alpha_{\text{sphere}} = \frac{F \cdot R}{\frac{2}{5} M R^2} = \frac{5F}{2M R}
     \]

3. **Angular Velocity**:
   - Starting from rest, the angular velocity \( \omega \) after time \( t \) is:
     \[
     \omega = \alpha \cdot t
     \]
   - Therefore, for each object:
     \[
     \omega_{\text{disk}} = \frac{2F}{M R} \cdot t
     \]
     \[
     \omega_{\text{hoop}} = \frac{F}{M R} \cdot t
     \]
     \[
     \omega_{\text{sphere}} = \frac{5F}{2M R} \cdot t
     \]

4. **Kinetic Energy**:
   - The rotational kinetic energy \( KE \) is given by:
     \[
     KE = \frac{1}{2} I \omega^2
     \]
   - Therefore, for each object:
     \[
     KE_{\text{disk}} = \frac{1}{2} \left( \frac{1}{2} M R^2 \right) \left( \frac{2F}{M R} \cdot t \right)^2 = \frac{1}{2} \cdot \frac{1}{2} M R^2 \cdot \frac{4F^2 t^2}{M^2 R^2} = \frac{1}{2} \cdot \frac{1}{2} \cdot 4 \cdot \frac{F^2 t^2}{M} = \frac{F^2 t^2}{M}
     \]
     \[
     KE_{\text{hoop}} = \frac{1}{2} \left( M R^2 \right) \left( \frac{F}{M R} \cdot t \right)^2 = \frac{1}{2} \cdot M R^2 \cdot \frac{F^2 t^2}{M^2 R^2} = \frac{1}{2} \cdot \frac{F^2 t^2}{M} = \frac{F^2 t^2}{2M}
     \]
     \[
     KE_{\text{sphere}} = \frac{1}{2} \left( \frac{2}{5} M R^2 \right) \left( \frac{5F}{2M R} \cdot t \right)^2 = \frac{1}{2} \cdot \frac{2}{5} M R^2 \cdot \frac{25F^2 t^2}{4M^2 R^2} = \frac{1}{2} \cdot \frac{2}{5} \cdot \frac{25}{4} \cdot \frac{F^2 t^2}{M} = \frac{25F^2 t^2}{20M} = \frac{5F^2 t^2}{4M}
     \]

5. **Ranking the Kinetic Energies**:
   - Comparing the kinetic energies:
     \[
     KE_{\text{hoop}} = \frac{F^2 t^2}{2M}
     \]
     \[
     KE_{\text{disk}} = \frac{F^2 t^2}{M}
     \]
     \[
     KE_{\text{sphere}} = \frac{5F^2 t^2}{4M}
     \]
   - Therefore, the ranking from least to greatest is:
     \[
     KE_{\text{hoop}} < KE_{\text{disk}} < KE_{\text{sphere}}
     \]

The final answer is $\boxed{\text{hoop, disk, sphere}}$