Provide an Appropriate Response $f ( x ) = 9 \left( 2 ^ { x } \right)$

Multiple Choice

Provide an appropriate response.
-Let f( $f ( x ) = 9 \left( 2 ^ { x } \right)$ ) , and consider the sequence f(1) , f(2) , f(3) , . . . . Is this a geometric sequence, and if so, what is the common ratio?

A) Yes; x
B) No
C) Yes; 2
D) Yes; 9