单选题 What problem is facing both developing and industrial nations?

A、 How to achieve literacy in their own countries.
B、 How the environment can be changed to suit the people.
C、 What methods of producing social and economic development can be found.
D、 What ways of encouraging literacy as part of national development are possibl

【正确答案】 D

【答案解析】第三段指出literacy不是社会发展的副产品而是其重要组成部分，但无论是developing countries还是developed countries都没有意识到这些只是追求本国的literacy achievement，因此选项D的内容是两者都面临的共同问题。