What is the number of [degrees](https://artofproblemsolving.com/wiki/index.php/Degree) in the smaller [angle](https://artofproblemsolving.com/wiki/index.php/Angle) between the hour hand and the minute hand on a clock that reads seven o'clock?
$\text{(A)}\ 50^\circ \qquad \text{(B)}\ 120^\circ \qquad \text{(C)}\ 135^\circ \qquad \text{(D)}\ 150^\circ \qquad \text{(E)}\ 165^\circ$
The smaller angle makes up $5/12$ of the [circle](https://artofproblemsolving.com/wiki/index.php/Circle) which is the clock.  A circle is $360^\circ$, so the measure of the smaller angle is 
\[\frac{5}{12}\cdot 360^\circ = 150^\circ \rightarrow \boxed{\text{D}}\]