Find the General Term $a_n$ , of the Given Arithmetic Sequence
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Multiple Choice

Find the general term, $a_n$ , of the given arithmetic sequence
- $3,12,21,30,39, \ldots$

A) $a_{n}=3(3 n-2)$
B) $a_{n}=6 n-9$
C) $a_{n}=3(9) ^{n-1}$
D) $a_{n}=9 n-2$