Bonita's Mother Pointed Out That Bonita and Ahmad Tended to Be

Bonita's mother pointed out that Bonita and Ahmad tended to be negative and slightly sarcastic to each other and that this was going to cause problems in the future if they got married. Bonita, an attentive psychology student, said:

A) research shows that commutation tends to improve after marriage.
B) research shows that commutation is not that important.
C) research did not support her mother's statement.
D) research support her mother's statement.