Question

Which one of the following factors has contributed most in the rapid rise of human population in the present century?

• A. Decrease in infant mortality
• B. Polygamy
• C. Decrease in birth rate
• D. Increase in death rate

Answer 1

The correct option is A Decrease in infant mortality

In the present century, reduced infant mortality contributed 4.5 years to overall improvements in life expectancy; reduced child mortality contributed nearly as much, and reduced mortality among young adults added about 3.5 years.

So, the correct answer is option A.