Which of the following is an example of a pull factor

A. oppression

B. famine

C. war

D. safety

The question is asking us "which of the following is an example of a pull factor" - and it refers to pull and push factors in immigration - a pull factor is one that "pulls" you towards a place, that is, attracts you to stay in a place. This would be something that is positive, or required - not something that you would want to avoid. The correct answer is then D. safety - the other factors would be push factors, they would push you away from the place.