If the urban popluation of the developing countries exceeds 2 billion people by the year 2000, the additional people will face the problem of ______.

A．living in comfortable family life-style
B．setting disputes peacefully
C．combating cancer and heart disease with energetic research
D．having greater government involvement in people's daily life

A．houses in shanty towns are cheap
B．shanty towns could provide people with minimum comfort
C．no policy will be capable of stopping or changing the present immigrant tendency from the rural areas to the cities in the Third World
D．the Third World population is growing at a rate of about 80 million people per year