The Authors of Your Textbook State That We Are Meaner

The authors of your textbook state that we are meaner to our intimate partners than anyone else. Which one of the following is NOT a reason for why we are that way?

A) We can be our true or real self when with our romantic partners.
B) Probability of ostracism increases with the duration of relationship.
C) Pet peeves, over time, damage the relationship.
D) Positive illusions that existed at the beginning to the relationship have been dulled.