The greatest common factor of the two numbers is 15, and the least common multiple is 90. These two numbers are () A. 15 and 90B. 30 and 60C. 45 and 90

Because 90 △ 15 = 6, 6 can be decomposed into two coprime numbers in two cases, i.e. 2 and 3, 1 and 6. So these two numbers have several cases: 15 × 1 = 15, 15 × 6 = 902 × 15 = 30, 3 × 15 = 45. A: these two numbers are 15 and 90 or 30 and 45

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