Which oils can undergo winterization?

Winterization is a process used primarily on certain vegetable oils to remove waxes and other impurities that can cause cloudiness when the oil is chilled. The oils that are most suitable for winterization are those that contain a significant amount of saturated fats and waxes, which are prone to solidifying at low temperatures.

Corn, soy, and cottonseed oils are commonly refined oils that undergo winterization to make them more visually appealing and to enhance their clarity when served cold or stored in cooler conditions. These oils typically have higher levels of waxes compared to oils like olive oil, which is more monounsaturated and generally does not need winterization.

In contrast, oils like olive oil are primarily used in their unrefined state or are sometimes filtered, but they do not usually undergo winterization since they do not contain the same levels of waxes that necessitate this process. Thus, the correct choice is the one that includes the oils known for being subjected to this treatment, which are corn, soy, and cottonseed oils.