【单选题】

Why is the campaign against illiteracy more important to Third World countries
A．Because 98 per cent of illiterates live in Third World countries.

B．Because illiterates in Third World countries don't know how important is the ability to read and write.
C．Because high rate of illiteracy is setting back the national development programs
D．Because many adults in Third World countries are too ashamed to admit they can't read and write.