Question

the vietcong were rebels in south vietnam who wanted to
rid both north and south vietnam of communist influence.
spread the catholic religion throughout vietnam.
overthrow the communists who controlled the country.
unify the south and north under a communist government.

Explanation:

The Vietcong (Vietnamese Communists) in South Vietnam aimed to unify North and South Vietnam under a Communist government. The other options are incorrect: they did not want to rid Vietnam of Communist influence (they were Communist), spreading Catholicism was not their goal, and they were not trying to overthrow Communists (North Vietnam was Communist and supported them).

Answer:

D. unify the South and North under a Communist government.