Final answer:
A saturated fatty acid is shown by a hydrocarbon chain that is fully saturated with hydrogen, without any double bonds. Given this, option 9 (C6H14) is a saturated fatty acid.
Step-by-step explanation:
To determine which molecule is a saturated fatty acid, we must look for a molecular structure that shows a hydrocarbon chain fully saturated with hydrogen atoms, meaning there are no double bonds between carbon atoms. The description provided indicates that option 9 is a molecule with the formula C6H14, which refers to a hydrocarbon chain without double bonds. Since saturated fatty acids are composed of hydrocarbon chains with only single bonds and are fully saturated with hydrogen, option 9 (C6H14) is most likely the saturated fatty acid.