A $2$-kg rock is suspended by a massless string from one end of a uniform $1$-meter measuring stick. What is the mass of the measuring stick if it is balanced by a support force at the $0.20$-meter mark?

[asy]
size(250);
draw((0,0)--(7.5,0)--(7.5,0.2)--(0,0.2)--cycle);
draw((1.5,0)--(1.5,0.2));
draw((3,0)--(3,0.2));
draw((4.5,0)--(4.5,0.2));
draw((6,0)--(6,0.2));
filldraw((1.5,0)--(1.2,-1.25)--(1.8,-1.25)--cycle, gray(.8));
draw((0,0)--(0,-0.4));
filldraw((0,-0.4)--(-0.05,-0.4)--(-0.1,-0.375)--(-0.2,-0.375)--(-0.3,-0.4)--(-0.3,-0.45)--(-0.4,-0.6)--(-0.35,-0.7)--(-0.15,-0.75)--(-0.1,-0.825)--(0.1,-0.84)--(0.15,-0.8)--(0.15,-0.75)--(0.25,-0.7)--(0.25,-0.55)--(0.2,-0.4)--(0.1,-0.35)--cycle, gray(.4));

[/asy]

$ \textbf {(A) } 0.20 \, \text{kg} \qquad \textbf {(B) } 1.00 \, \text{kg} \qquad \textbf {(C) } 1.33 \, \text{kg} \qquad \textbf {(D) } 2.00 \, \text{kg} \qquad \textbf {(E) } 3.00 \, \text{kg} $
1. **Identify the forces and distances involved:**
   - The rock has a mass of \(2 \, \text{kg}\) and is suspended at the end of the measuring stick, which is \(1 \, \text{m}\) from the pivot point.
   - The measuring stick is uniform, so its center of mass (COM) is at its midpoint, which is \(0.5 \, \text{m}\) from either end.
   - The support force is applied at the \(0.20 \, \text{m}\) mark from one end.

2. **Set up the torque equilibrium equation:**
   - The torque due to the rock is \( \tau_{\text{rock}} = (2 \, \text{kg}) \cdot g \cdot (1 \, \text{m} - 0.20 \, \text{m}) = 2g \cdot 0.80 \, \text{m} \).
   - The torque due to the measuring stick is \( \tau_{\text{stick}} = m \cdot g \cdot (0.50 \, \text{m} - 0.20 \, \text{m}) = m \cdot g \cdot 0.30 \, \text{m} \).

3. **Write the torque equilibrium equation:**
   \[
   \tau_{\text{rock}} = \tau_{\text{stick}}
   \]
   \[
   (2 \, \text{kg}) \cdot g \cdot 0.80 \, \text{m} = m \cdot g \cdot 0.30 \, \text{m}
   \]

4. **Simplify and solve for \(m\):**
   \[
   2 \cdot 0.80 = m \cdot 0.30
   \]
   \[
   1.60 = 0.30m
   \]
   \[
   m = \frac{1.60}{0.30}
   \]
   \[
   m = \frac{160}{30}
   \]
   \[
   m = \frac{16}{3}
   \]
   \[
   m \approx 1.33 \, \text{kg}
   \]

The final answer is \(\boxed{1.33 \, \text{kg}}\).