Find an Explicit Rule for the Nth Term of the Arithmetic

Multiple Choice

Find an explicit rule for the nth term of the arithmetic sequence.
- $$- 9 , - 17 , - 25 , - 33 , \ldots$$

A) $a _ { n } = - 9 - ( - 8 ) ( n + 1 )$
B) $a _ { n } = - 9 + ( - 8 ) ( n - 1 )$
C) $a _ { n } = - 9 + ( - 8 ) ( n + 1 )$
D) $a _ { n } = - 9 \times ( - 8 ) ( n - 1 )$