Change the Exponential Expression to an Equivalent Expression Involving a Logarithm

Multiple Choice

Change the exponential expression to an equivalent expression involving a logarithm.
- $9 ^ { 2 } = y$

A) $\log _ { 9 } \mathrm { y } = 2$
B) $\log _ { 2 } \mathrm { y } = 9$
C) $\log _ { \mathrm { y } } 9 = 2$
D) $\log _ { \mathrm { y } } 2 = 9$