Answer:
D - 20, 40, 60, 80, 100 are all multiples of 20
Explanation:
Factors of 10 - 10, 5, 2, 1
Multiples of 10 - D and 10, 30, 50, 70, 90
Factors of 20 - 20, 10, 5, 4, 2, 1
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