What is the best definition of a refugee? an immigrant who is denied entry into a country
an immigrant who lives and works in a country illegally
an immigrant who comes seeking economic opportunities
an immigrant who leaves an area to escape war or oppression

an immigrant who leaves an area to escape war or oppression

Explanation:

A refugee is an immigrant who leaves an area to escape war or oppression.

Most refugee are held in a camp so as to address their collective needs

answer; i believe the correct answer is (a) nigeria is the largest african crude (oil) supplier; /// so revenue from petroleum;

a and b because with the other three, they simplify to something else.