Write a Formula for the General Term, or Nth Term $a _ { n } = - 3 + ( - 3 ) ^ { n }$

Multiple Choice

Write a formula for the general term, or nth term, for the given sequence.
--3, 9, -27, 81, . . .

A) $a _ { n } = - 3 + ( - 3 ) ^ { n }$
B) $a _ { n } = - 9 ^{n - 1}$
C) $a _ { n } = - 3 ( - 3 ) ^ { n - 1 }$
D) $a _ { n } = - 3 ( - 3 ) ^ { n }$