The stage of a relationship involves impersonal communication and is the most frequent type of relationship people have. a. intimacy b. involvement c. repair d. contact

I'd have to say the answer is D. Contact

The CONTACT stage of a relationship involves impersonal communication and is the most frequent type of relationship people have. 
The only one of these answer choices that make sense is D. Contact, here why: 
Intimacy is a special thing, but it isn't frequent.
Involvement means you're doing things together, and getting along well. 
Repair, meaning when you have an issue in the relationship.
Contact is something that is done with almost every relationship. It's away to still stay close with your friends, family, and boyfriend/girlfriend. It's commonly used everyday.

The D. Contact 

Good luck with your studies, I hope this helps~!

Rhyme is can both understand what the writer is writing about clearly you know the consign words will rhyme