Let $s ^ { 2 } = 200 + x ^ { 2 }$

Multiple Choice

Let $s ^ { 2 } = 200 + x ^ { 2 }$ If $\frac { d x } { d t } = - 6$ when $x = 5 \text {, }$ then $\frac { d s } { d t }$ is

A) -6
B) -4
C) -2
D) 2
E) 4