Economists in India, Pakistan, the Philippines, and Mexico argue that food grain growth would not have kept up with population growth in the last four decades without
I the improved packages of high-yielding seed varieties.
II fertilizers, pesticides and irrigation.
III improved transportation.
IV better extension service.
a. I and II only.
b. II and III only.
c. I, II and III only.
d. I, II, III and IV.
Answer: D