Gottman's Research on Conflict Between Partners in a Relationship Supports

Gottman's research on conflict between partners in a relationship supports which of the following?

A) Conflict alone is not necessarily bad for a relationship. The way the couple handles the conflict is important, though.
B) Conflict tends to be a sign of relationship problems and predicts deterioration of the relationship.
C) Conflict is a healthy and beneficial part of relationships. Lack of conflict predicts deterioration of relationships.
D) Conflict between partners comes in many shapes and sizes. There are no systematic relationships between styles of conflict and relationship outcome.