Please help me, I don't understand Which is true about the “push-pull” theory of voluntary migration?

The transatlantic slave trade pushed millions of Africans against their will to the European colonies.

People migrate because their personal difficulties “push” them to leave.

In the 1840s, a disease destroyed the potato crop in England, pulling people to migrate.

People migrate because a lack of religious freedom “pulls” them to a new country.

Which of the following is true of cultural syndromes of distress? a. it refers to attributing pathological symptoms to normative cultural differences. b. refers to misinterpreting culturally sanctioned behavior as expressions of pathological symptoms. c. it refers to the ways that communities and cultural groups communicate and express their distressing thoughts, behaviors, and emotions. d. it refers to patterns of symptoms that tend to cluster together for individuals in specific cultural groups, communities, or contexts.