40, 3, 35, 6, 30, 9, （), 12, 20, （)A. 15,225 B. 18,25 C. 25,15 D. 25,18

40, 3, 35, 6, 30, 9, (), 12, 20, ()

A. 15,225 B. 18,25 C. 25,15 D. 25,18

请帮忙给出正确答案和分析，谢谢！