Prototypes of international agricultural research centers are the ?

I- international Center for the Improvement of Maize and Wheat (CIMMYT)
II- International Rice Research Institute (IRRI)
III- Synthetic Rubber Research Institute (SRRI)
IV- Center for International Agricultural production Control (CIAPC)
A. I only
B. I and II only
C. III and IV only
D. Iv only