Use Braces to Write the Members of the Set, or State

Multiple Choice

Use braces to write the members of the set, or state that the set has no members.
-The positive-integer powers of 3

A) $\{ 1,3,9,27,81,243 , \ldots \}$
B) $\{ 1,8,27,64,125 , \ldots \}$
C) $\{ 3,9,27,81,243 , \ldots \}$
D) $\{ 3,6,9,12,15 , \ldots \}$