The correct option is D A and C
Population explosion refers to the sudden and rapid rise in the size of the population, especially the human population. This leads to a wide variety of problems including reduction in the per capita income, poverty, lower standard of living, etc.
It also has a negative impact on the environment. It leads to the cutting of forests for cultivation. It also leads to the migration of a large number of people to urban areas with industrialization. This can result in polluted air and water.
A famine is a widespread scarcity of food, which is caused by several factors including war, crop failures, population explosion, or government policies. This phenomenon is normally followed by regional malnutrition, starvation, epidemics, and increased mortality rate.
Famine, unemployment, food crisis etc. are other problems associated with population explosion.