Find a General Term an for the Sequence Whose First $2,4,8,16 , \ldots$

Multiple Choice

Find a general term an for the sequence whose first four terms are given.
- $2,4,8,16 , \ldots$

A) $a _ { n } = 2 + 2 ( n - 1 )$
B) $a _ { n } = 2 n - 1 + 1$
C) $\mathrm { a } _ { \mathrm { n } } = 2 \mathrm { n }$
D) $a _ { n } = 2 n$