The contest on Mount Carmel was a challenge between the prophet Elijah and the prophets of Baal to prove which one was the true God. The prophets of Baal built an altar and prayed to their god to send fire to light the sacrifice, but nothing happened. Elijah then built an altar to the Lord, and after he prayed, God sent fire to consume the sacrifice. This was to prove that God was the one true God and had power over nature, not Baal or any other false gods. Therefore, the correct answer is that the contest on Mount Carmel was to prove that God was supreme to other gods.