年金保险按照交费方法的不同，可分为()

A.即期年金和延期年金

B.期缴年金和趸缴年金

C.定期年金和终身年金

D.定额年金和变额年金

______ he likes English or not, he has to study it.[ ]

A. If

B. Whether

C. When

D. Why