Provide an Appropriate Response $y \sqrt { x + 1 } = 12$

Multiple Choice

Provide an appropriate response.
-If $y \sqrt { x + 1 } = 12$ and $d x / d t = 8$ , then what is $d y / d t$ when $x = 15$ and $y = 3$ ?

A) $- \frac { 4 } { 3 }$
B) $\frac { 4 } { 3 }$
C) $\frac { 3 } { 4 }$
D) $- \frac { 3 } { 4 }$