Answer: Correct option is option(c)
Step-by-step explanation:
Peer is defined as the group of people that are present in social manner having same age, background, interest etc. Peer group of an individual who have same age can make the person compare himself/herself with others.As the children group has same age it would be easy for a child to compare and understand.
Other options are incorrect because same gender friend, world's perspective through someone else's way and sharing close emotions are the possible feature that can be performed by a sibling. Thus, the correct option is option(c).