This was not a popular question among the candidates and most of those who answered the question could not properly answer the (a) aspect of the question.
    The expected answer are:

            Census – is the official head count of people living in an area at a given time.

            Mortality rate – is the number of deaths per thousand of population per year in an area.

            Family Planning – This refers to the controlling of the number of children which a
            couple can have and care for through adequate spacing and other birth control
            measures.

The problems confronting the country that is overpopulated area high dependency ratio,pressure on social amenities, overcrowding, traffic congestion, environmental degradation, pressure on agricultural lands, unemployment, social vices, development of slums/ghettos, waste management problems, shortage of food, increase in crime rate,   inadequate housing and high cost of living.

The ways of solving problems of overpopulation include family planning/birth control measures, legislation against early marriages, development of quality manpower, encouragement of education of the man child, industrializing the rural areas, encouragement of education of the female child, industrializing the rural areas,   encouragement of emigration, sex education, tax regimes to favour small family sizes, increase in food supply, discouragement of polygamy, stringent immigration laws and development of satellite towns.