Answer:
D. polyunsaturated
Explanation:
A fatty acid consists of carbon atom chain linked by chemical bonds some of which may be double bonds.Polyunsaturated Fatty Acid also known as PUFA is characterized by the presence of two or more carbon double bonds in the chain. In case the carbon chain contains only one single double bond, the resulting fatty acid is known as monounsaturated fatty acid.So option D is the required option in this case.
