Answer:
D. 1, 3, 5, 15
Explanation:
Factors are numbers that divide another number evenly, with no remainders.
15 ÷ 1 = 15
15 ÷ 3 = 5
15 ÷ 5 = 3
15 ÷ 10 = 1.5
15 ÷ 2 = 7.5
15 ÷ 15 = 1
The numbers that 15 divide evenly into are 1, 3, 5, and 15.
Hope that helps.