Which best describes the results of global population increase in the twentieth century?

Question options:

regional youth protests and upheavals

enlarged social welfare programs

increased production of waste and pollution

excessive migration to Western nations

Enlarged social welfare programs which aware eople about health, hygiene and well-being are crucial factors for population growth. The aids of the governments in immunization and vaccination of the people, easliy availabe healthcare and improved standard of living are also significant factors, and are interrelated.