Question: What is the opposite of dissociate with someone?

Choices: 
- fuse
- unit
- join
- combine
- incorporate

The rationale to choose "join" as the answer is that: 

dissociate is the opposite of associate. it comes from the latin dissociare, which means basically "to disunite." to dissociate is to stop associating with someone. if a relationship ends, the two people are dissociated from one another.