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, 8, 27, 64, 125, . . .}


B.
{3, 9, 27, 81, 243, . . .}


C.
{3, 6, 9, 12, 15, . . .}


D.
{1, 3, 9, 27, 81, 243, . . .}