Oil found in groundnut accumulates in
Arachis hypogaea, commonly known as groundnut or peanut is a legume crop which is grown mainly for its edible seeds and oil present in the seeds i.e in cotyledons. It belongs to family Fabaceae. In groundnut, the cotyledons are the source of food and oil. Peanut oil is often used in cooking. Due to its monounsaturated content, it is considered more healthful than saturated oils and it is resistant to rancidity. So, the correct answer is 'Cotyledons'.