Which of these is part of a healthy relationship?
a. refusing to cooperate
b. responding before your friend finishes talking
c. choosing to compromise
d. crossing someone else's boundaries

The correct answer is C.

Choosing to compromise is part of a healthy relationship. All relationships need to have compromise otherwise it will be a one sided relationship where one person always fulfills their own needs and doesn't take the needs of the other person into consideration which is just selfish behavior.

All other options would be unhealthy and self serving.