I think he means that humans don’t like being alone. It’s our nature to find someone or have a companion throughout our lives. We instinctfully talk to people to interact or make friends. That’s what I think he means
The main idea in the above paragraph is that D.) Different Societies have different ideas about the purpose of marriage.
American society marry because the couple romantically love each other.
Other society marry for economic purposes. Still other society marry to retain the pureness of the lineage, to secure the family wealth within its grasp, and to further amass power and privileges.
The answer might be False dichotomy
