Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Solve the equation.
- $$5 ^ { 2 z + 3 } = 625$$

A) $\left\{ \frac { 1 } { 2 } \right\}$
B) $\{ 311 \}$
C) $\{ 4 \}$
D) $\left\{ \frac { 1 } { 5 } \right\}$