Thanks to the policy, birth rates in the country_____ 2 percent annually for the past five years.

A. have been risen 　　　　　　　 B. have been rising 　 C. are rising　　　 D. are risen

Thanks to the policy, birth rates in the country_____ 2 percent annually for the past five years.

1. A.
   have been risen
2. B.
   have been rising
3. C.
   are rising
4. D.
   are risen

Thanks to the policy, birth rates in the country_____ 2 percent annually for the past five years.

Thanks to the policy, birth rates in the country_____ 2 percent annually for the past five years.

Thanks to the policy, birth rates in the country_____ 2 percent annually for the past five years.