Let $A = ( 10 + x ) ^ { 2 }$

Multiple Choice

Let $A = ( 10 + x ) ^ { 2 }$ If $\frac { d x } { d t } = \frac { 2 } { 15 }$ when then $\frac { d A } { d t }$ is

A) 8
B) 6
C) 4
D) 2
E) $\frac { 1 } { 2 }$