Cooking oil can be converted into vegetable ghee by the process of _____.

Cooking oil can be converted into vegetable ghee by the process of hydrogenation (option B). Hydrogenation adds hydrogen atoms to unsaturated fatty acids in liquid oils, making them solid at room temperature. This is the same process used to make margarine. Oxidation would degrade the oil, distillation separates components, and crystallization is a purification technique.