HELP PLEASE I NEED FOR A QUIZ! 
 Which is a complete list of factors of each term in the expression 16a+18ab?
 A.16a: 1, 2, 4, 8, 16
 18ab: 1, 2, 3, 6, 9, 18
 B.16a: 1, 2, 4, 8, 16, a
 18ab: 1, 2, 3, 6, 9, 18, b
 C.16a: 2, 4, 8, a
 18ab: 2, 3, 6, 9, a, b
 D.16a: 1, 2, 4, 8, 16, a
 18ab: 1, 2, 3, 6, 9, 18, a, b