Solve the Formula for the Indicated Letter $q = \frac { p } { \sqrt { p ^ { 2 } + 1 } }$

Multiple Choice

Solve the formula for the indicated letter. Assume that all variables represent nonnegative numbers.
- $q = \frac { p } { \sqrt { p ^ { 2 } + 1 } }$ , for $p$

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