Solve the Problem $9,9 \sqrt { 2 } , 18,18 \sqrt { 2 } , \ldots$

Multiple Choice

Solve the problem.
-Find the nth term of the following geometric sequence: $9,9 \sqrt { 2 } , 18,18 \sqrt { 2 } , \ldots$

A) $9 ( 2 ) ^ { n - 1 }$
B) $9 \cdot 2 ^ { n }$
C) $9 ( \sqrt { 2 } ) ^ { n - 1 }$
D) $9 ( \sqrt { 2 } ) ^ { n }$