Mark knows his relationship with his partner will soon end. he is now talking with friends and family, telling them his side of the story and garnering support. mark is in the of the dissolution of his relationship.
a) resurrection phaseb) personal phasec) dyadic phased) social phase

Social phase

Explanation:

The social phase is basically about made breakup in public within their social circle. When breakup made every partner needs support. In this phase, a person wants that his close friends will pick a side and do gossips with him/her.

This situation will make the judgment about one partner. In the social phase, someone will end the relationship with the open secrets of another partner to help the relationship that can be built again. But the threshold will inevitable and one of the partners thinks that this is the point where they can not return.  

Thus in the above statement, Mark and his partner are in the social phase where Mark is in the dissolution of his relationship.