Write an Equivalent Expression in Exponential Form $$\log _ { 5 } x = 3$$

Write an equivalent expression in exponential form.
- $$\log _ { 5 } x = 3$$

A) $\{ 8 \}$
B) $\{ 125 \}$
C) $\{ 243 \}$
D) $\{ 15 \}$