the most serious problems surrounding the world hunger situation are that food production gains in the developing world have been consumed by rapid population growth; that efficient methods of distribution have not been developed to transport food to areas of greatest need; that millions of people cannot afford subsistence food even when it is available.

question) we can infer from the above passage that, in order to effect a solution to the world hunger situation, it will be necessary to .

a. improve methods for international transportation of food supplies
b. grow more grain
c. provide medical care for people in developing areas
d. identify areas of greatest need

답이 a라고 하는데 b도 맞지 않나요?

도움 부탁드립니다~