Write the First Four Terms of the Geometric Sequence with the Given

Multiple Choice

Write the first four terms of the geometric sequence with the given first term, a1, and common ratio, r.
- $$a _ { 1 } = 9 ; r = 2$$

A) $9,18,36,72 , \ldots$
B) $9,11,13,15 , \ldots$
C) $2,18,162,1458 , \ldots$
D) $18,36,72,144 , \ldots$