Question 1 of 100

List all the common factors of 40 and 80.

A
1, 4, 5, 7, 8, 10, 20, 40
B
1, 2, 4, 5, 10, 20, 40
C
1, 2, 4, 8, 9, 10, 20, 40
D
1, 2, 4, 5, 8, 10, 20, 40