Question

environmental degradation is a ______ factor.
push
pull

Explanation:

In the context of factors influencing migration (a common topic in Social Science, specifically related to concepts like push - pull factors), environmental degradation is a push factor. Push factors are those that drive people away from an area. Environmental degradation (such as pollution, lack of resources due to environmental damage) makes an area less desirable to live in, so it "pushes" people to leave. Pull factors are attractions that draw people to an area.

Answer:

A. Push