Answer:
A. stabilize the market for oil.
Explanation:
OPEC was an organization that was founded by the world's largest oil producers in order to control the price of oil in the market.
Before this organization exist, these large oil producers have to compete with one another in order to sell their oil in the market. As a result, they have to constantly lower the price of oil in order to increase the sales of their product. They soon realized that joining forces within one organization will be more beneficial for them rather than being competitors. Members of OPEC will create a standardized oil price that must be followed by all members (none of them can sell their oil outside this standardized price). This helped stabilize the market for oil.
