What Is a Noticeable Tendency Among Couples with Regard to Conflict

What is a noticeable tendency among couples with regard to conflict style?

A) Most couples change conflict styles often, fighting constructively one month and more destructively the next.
B) Most couples can't be categorized as using one conflict style.
C) Although change is possible, couples tend to maintain the same conflict style.
D) Couples maintain conflict styles, never changing.