The correct option is A Stearic acid
The fatty acids which do not contain double bonds are called saturated fatty acids, e.g, palmitic acid (fatty acid containing 16 carbon atoms), stearic acid (fatty acid containing 18 carbon atoms). Unsaturated fatty acids have one or more double bonds, e.g., oleic acid (one double bond), linoleic acid (two double bonds), linolenic amino acids (three double bonds) etc.