Write an Equivalent Expression in Exponential Form $\log 9 \sqrt { 910 } = x$

Multiple Choice

Write an equivalent expression in exponential form.
- $\log 9 \sqrt { 910 } = x$

A) $\{ 5 \}$
B) $\{ \sqrt { 5 } \}$
C) $\{ 90 \}$
D) $\{ 45 \}$