The world’s population is concentrated in certain countries like china most likely because a. there being endemic diseases in the country. b. the lack of availability or lack of use of contraceptives. c. the emigration of people from more populated countries. d. the country’s land mass, which is much larger.

b

Explanation:

i promise it is, im taking the test at the moment and just saw the answer on the answer document.

B.the lack of availability or lack of use of contraceptives.

Explanation:

China is the most populated country in the world. The buzz echoed as far back as the 1970s, when data was already recording high annual growth. Thus, from this period, the government has adopted strict birth control measures, which has had an effect in recent years. In 2005 the Chinese population reached about 1.3 billion people, even with this huge contingent the country achieved considerable improvements in quality of life, a decrease in the mortality rate that is now one of the lowest in the world, a drop in unemployment rates and increase in the amount of calories eaten daily by people.

This is the result of family planning measures with birth control, and mainly due to political and economic openness. Since the early 1990s, the country's economy has been seen as the fastest-growing economy, and has been progressing steadily towards becoming a world power.