Which set contains only factors of 181818?
{1,2,3,6,9,18}\{1, 2, 3, 6, 9, 18\}{1,2,3,6,9,18}
{2,4,6,18}\{2, 4, 6, 18\}{2,4,6,18}
All even numbers{\text{All even numbers}}All even numbers
{3,5,9,18}\{3, 5, 9, 18\}{3,5,9,18}