. What are the factors of 60 ?

A. 1,2,3,4,5,6,10, 12,15, 30,20, 60
B. 1,2,3,4,5,6, 7,10, 12,15, 30,20, 60
C. 1,2,3,4,5,6, 8,10, 12,15, 30,20, 60
D. 1,2,3,4,5,6, 9,10, 12,15, 30,20, 60