Provide an Appropriate Answer $\frac { \partial z } { \partial v }$

Multiple Choice

Provide an appropriate answer.
-Find $\frac { \partial z } { \partial v }$ when $u = 5$ and $v = 1$ if $z ( x ) = \frac { x } { \sqrt { x + 5 } }$ and $x = u \cdot v$ .

A) $\frac { \partial \mathrm { z } } { \partial \mathrm { v } } = \frac { 75 } { 2 ( 10 ) ^ { 3 / 2 } }$
B) $\frac { \partial z } { \partial v } = \frac { 75 } { 2 \sqrt { 10 } }$
C) $\frac { \partial \mathrm { z } } { \partial \mathrm { v } } = 0$
D) $\frac { \partial \mathrm { z } } { \partial \mathrm { v } } = \frac { 15 } { 2 ( 10 ) ^ { 3 / 2 } }$