Find the Indicated Derivative $\frac { d p } { d q }$

Multiple Choice

Find the indicated derivative.
- $\frac { d p } { d q }$ if $p = \frac { 1 } { \sqrt { q + 1 } }$

A) $\frac { 1 } { 2 ( q + 1 ) \sqrt { q + 1 } }$
B) $- \frac { 1 } { ( q + 1 ) \sqrt { q + 1 } }$
C) $- \frac { 1 } { 2 \sqrt { q + 1 } }$
D) $- \frac { 1 } { 2 ( q + 1 ) \sqrt { q + 1 } }$