Question

on what factors do most of the social differences based upon

Answer 1

Birth ,Choice,Religion. But most of on birth.

Answer 2

There are two main factors on which the social differences are based;  the accident of birth and on the basis of choices.

The accident of birth: Ordinarily, we don’t decide to relate to our society. The only reason why we belong is that we were born into it. We often observe differences from people around us related to our heights, weights, physical abilities etc.

The basis of choices: we experience differences in our daily life, for instance, we see some people are skeptics; they do not consider anything like God or religion. Some other people even follow the religion of other community, in which they were not born.