If the Ratio of Rise to Run Is to Be $\frac { 1 } { 2 }$

Multiple Choice

If the ratio of rise to run is to be $\frac { 1 } { 2 }$ for some stairs and the measure of the run is 31 inches, find the measure of the rise to the nearest inch.

A) 62 in.
B) 15 in.
C) 26 in.
D) 16 in.
E) 31 in.