Bowen believed that, generally speaking, people choose mates with levels of differentiation than their own:

The correct answer to this open question is the following.

Although the question has no options, we can say the following.

Bowen believed that generally speaking, people choose mates with about the same levels of differentiation than their own.

We are referring to Murray Bowen, a psychoanalyst that developed the concept of the family system theory and the family system therapy. It was based on the idea that individuals cannot separate from their family and friends. He created his form of therapy at the end of the 1960s and based his studies on its own family network and o those families that had family members with schizophrenia. The three types of therapies he developed were Strategic Family Therapy, Structural Family Therapy, and the Intergenerational Family Therapy.