Determine Whether the Sequence Is Arithmetic $n$ Begins with 1 $$a _ { n } = 6 + 4 n$$

Multiple Choice

Determine whether the sequence is arithmetic. If so, find the common difference. (Assume that $n$ begins with 1 .)
$$a _ { n } = 6 + 4 n$$

A) $- 4$
B) $- 6$
C) 6
D) 4
E) not arithmetic