Option D is correct.
Oleic acid is the unsaturated fatty acid. Fatty acids are classified into saturated and unsaturated fatty acids. Saturated fatty acids do not have any double bonds between the carbon atoms in their chain, while unsaturated fatty acids have at least one double bond. Unsaturated fatty acids are considered to be healthier than saturated fatty acids because they can help to lower cholesterol levels and reduce the risk of heart disease. Oleic acid is a monounsaturated fatty acid, which means that it has one double bond in its chain. It is the most common monounsaturated fatty acid in the human diet and is found in many plant-based oils, such as olive oil and avocado oil.
The other options are saturated fatty acids:
Palmitic acid is a long-chain saturated fatty acid that is found in many animal products, such as meat, butter, and cheese.
Arachidic acid is a long-chain saturated fatty acid that is found in peanuts, peanut oil, and chocolate.
Stearic acid is a long-chain saturated fatty acid that is found in beef, lamb, and cocoa butt