List the Elements in the Set

Multiple Choice

List the elements in the set.
-The set of all positive integer powers of 3.

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