Nonstrategic, routine behaviors that couples perform, such as using humor or joking, self-disclosure, and positivity, are examples of
a) initiating behaviors
b) de-escalation behaviors
c) relational maintenance behaviors
d) terminating behaviors

Nonstrategic, routine behaviour that couples perform, such as using humour or joking, self-disclosure, and positive, are examples of relational maintenance behaviours

C. relational maintenance behaviour.

Explanation:

In every relationship, people will deliver many kinds of behaviours. They put some effort among themselves to show how they really feel or want. This kind of behaviour expressing to maintain in a relationship is known to be relational maintenance behaviour.

It consists of 5 behaviours they are: positivity, Openness, commitments, socially connecting and shared tasks. In the early stage of maintenance behaviour, people will be more positive about themselves so that it will make a good impression of them.

And they will try to be more humorous so that the conversation won't be boring at all. Finally, Openness to tell them how they feel about anything or what to share about anything etc.

on the first day of new student week, amber revealed to her roommate that she is a lesbian. this is an example of self-disclosure.