Answer:
Option (C).
Step-by-step explanation:
Fatty acids may be defined as the compound containing long hydrocarbon chains with the carboxylic acidic group. Two main types of fatty acid are saturated and unsaturated fatty acid.
Unsaturated fatty acids contains the double and triple bond in its structure. The option (C) in the picture contains the carboxylic acid with long hydrocarbon chain and double bond in its structure.
Thus, the correct answer is option (C).