What does "to see the elephant mean"?

The correct answer is B) the lack of availability or lack of use of contraceptives.

The world’s population is concentrated in certain countries like China most likely because of the lack of availability or lack of use of contraceptives.

There are many countries, most of the underdeveloped countries, that lack of a sexual education program in school. The government also does not have sexual education campaigns for families and many people do not use a contraceptive or condom to control natality. That is why certain countries have overpopulation in their territories. That is the case of China or India.