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.
- $\log _ { x } \left( \frac { 2 } { 5 } \right) = 1$

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