In what region were Semitic religions predominant?

A. Europe

B. North and South America

C. Eastern Asia and Indonesia

D. Southwest Asia and Northern Africa

I think that the best answer is: D. Southwest Asia and Northern Africa.

This corresponds to today's Egypt, Israel and Saudi Arabia - the places there the Semitic people live and where they have historically lived. So Semitic religions are most likely found where the Semitic peoples live.