Determine Whether the Sequence Is Geometric $7,21,63,189 , \ldots$ A)Geometric Sequence $r = 3$

Multiple Choice

Determine whether the sequence is geometric.If so, find the common ratio. $7,21,63,189 , \ldots$

A) Geometric sequence, $r = 3$
B) Not a geometric sequence
C) Geometric sequence, $r = 8$
D) Geometric sequence, $r = 7$
E) Geometric sequence, $r = 4$