Find the General Term of the Arithmetic Sequence Then Find $a _ { n }$

Multiple Choice

Find the general term of the arithmetic sequence then find the indicated term of the sequence. Assume that the domain of the sequence is all natural numbers.
-Find $a _ { n }$ and $a _ { 8 }$ .

A) $a _ { n } = n + 1 ; a _ { 8 } = 9$
B) $a _ { n } = n - 2 ; a _ { 8} = 6$
C) $a _ { n } = n + 2 ; a _ { 8 } = 10$
D) $a _ { n } = n - 1 ; a _ { 8 } = 7$