In a a person is assigned a status at birth and remains at that level throughout life.
a. a caste system
c. a closed system
b. an open system
d. a class system

A. A caste system.

Explanation:

The caste system is used by Indians to divide the population, and it's one that doesn't allow people from reaching a different level.

The upper and lower castes usually don't share the same communities, the same water, and people can only marry one within their castes, making it impossible for a Dalit for example (a member of lower castes) to become a Brahmin.

i'll just take the points xd

answer; i do believe that its(gestation,suction-aspiration or vacuum aspiration;