Write the Expressions in Exponential Notation $( 9 \cdot 9 )$

Write the expressions in exponential notation.
-The area of a square whose sides each measure 9 meters iss ( $( 9 \cdot 9 )$ ) squar) squae meters. Write this area using exponential notation.

A) $( 2 + 9 )$ ) m
B) $9^2$ sq m
C) $2 ^ { 9 }$ sq m
D) ( $( 2 \cdot 9 )$ ) sq m sq