The tidal bulge on the side of the Earth facing the tide-raising body is caused by the difference between the tidal force at the surface of the Earth and the tidal force at the Earth's center.

Explanation:

Tidal bulges

Tide-raising power  

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]

the correct answer is c