B. Demographic transition refers to a shift in death rates followed by a shift in birthrates, and its associated population boom.
C. Most developing nations are going through a demographic transition today.
Explanation:
Demographic transition is a model that describes the changes that take place with the advancement of technology and the large scale control of death rates and the spread of diseases, and the development of the population boom in various countries.
The developing countries like India are still going through stage three pf the demographic transition. Thus shows a marked increase in population and is set to surpass China in the coming years.
