According to erikson, an adolescent's reliance on peers to them define their identities and learn to form relationships is the link between

It would be in the link between  identity versus identity confusion and intimacy versus isolation stages 

identity confusion and intimacy refers to the process where individuals started to find their true purpose/role within their social group in their attempt to get sense of belonging (intimacy).

The isolation stages refers to the period of development where we tend to isolate some group of people that we perceived as the one that prevent us from figuring our roles and getting the intimacy.

The answer is c) protestant clergy