The correct answer is the second option: Fats are a type of lipid. The first option is incorrect, because lipids are the larger, overarching group that fats fall under. The third option is incorrect because fats and lipids are completely related, as displayed by the correct answer. Fats are a specific type of lipid. The last option is incorrect. Although all fats are lipids, all lipids are not fats. Lipids also comprise waxes, phospholipids, sterols, etc.
