which of the following fatty acids is a polyunsaturated fatty acid?\nneed help on this question?

which of the following fatty acids is a polyunsaturated fatty acid?\nneed help on this question?
Answer
Explanation:
Step1: Recall polyunsaturated fatty - acid definition
A polyunsaturated fatty acid has more than one carbon - carbon double bond.
Step2: Examine each structure
The first structure has no double bonds, it is a saturated fatty acid. The second structure has one double bond, it is a monounsaturated fatty acid. The third structure has two double bonds, so it is a polyunsaturated fatty acid.
Answer:
The third fatty - acid structure (the one with two carbon - carbon double bonds) is a polyunsaturated fatty acid.