As used by demographers, a is a group of people who live in a specified geographic area.

Demography is the measurable investigation of populaces, particularly humans. As an exceptionally broad science, it can examine any sort of unique living populace, i.e., one that progressions after some time or space. Demographer is a man who ponders changes in quantities of births, relational unions, deaths, and so forth in a territory over some time frame.

did mary wollstonecraft believe was a natural ingredient for women’s happiness?

so you should go with

a. strong