The correct answer is true.
It is true that anti-Semitism in Russia in the late 1800s was a "push" factor that caused many people to leave their home country and migrate to the United States.
When we are talking about immigration terms, push-pul factors como to mind. A push factor is the factor that forces people to levae their native countries. It could be political persecution, religious differences, civil war or poverty. A pull factor is a factor that attracts people to emigrate to other country. It could be better jobs, peace, stability, or better living conditions in general. So yes, anti-Semitism in Russia in the late 1800s was a "push" factor that caused many people to leave their home country and migrate to the United States.