Even though its per capita food supply has hardly increased in two decades, stringent rationing and planned distribution have allowed the People’s Republic of China to ensure nutritional levels of 2,000 calories per person per day for its population.
我把its指rationing and distrbution 作为指代逻辑错误, 以及主句谓语have ...复数形式作为排除AB的依据了 : (
24.Even though its per capita food supply hardly increased during two decades, stringent rationing and planned distribution have allowed the People’s Republic of China to ensure nutritional levels of 2,000 calories per person per day for its population.
(B) Even though its per capita food supply has hardly increased in
(C) Despite its per capita food supply hardly increasing over