One of the biggest factors which determines your self concept is your:
a. body.
b. family.
c. friends.
d. heredity.

One of the biggest factors which determines your self concept is your body. The term self-concept is a general term used to refer to how someone thinks about, evaluates or perceives themselves. To be aware of oneself is to have a concept of oneself. IT was even define bu Baumeister as "The individual's belief about himself or herself, including the person's attributes and who and what the self is".

Im pretty sure it’s is c