Find the Indicated Nth Term of the Geometric Sequence $3,21,147 , \ldots$

Multiple Choice

Find the indicated nth term of the geometric sequence.
7th term : $3,21,147 , \ldots$

A) $a _ { 7 } = 50,421$
B) $a _ { 7 } = 7,203$
C) $a _ { 7 } = 17,294,403$
D) $a _ { 7 } = 352,947$
E) $a _ { 7 } = 2,470,629$