What Is the Double-Edged Sword in Relationships, According to Goleman

What is the double-edged sword in relationships, according to Goleman?

A) Forming them is difficult, so individuals are unlikely to exert the effort, and yet a lack of relationships is causally related to mental illness.
B) Positive relationships enhance health, whereas negative relationships produce adverse effects on mental health.
C) All relationships will inevitably reach a stage of conflict, so individuals must be prepared to deal with conflict when they enter into a relationship.
D) none of these