Final answer:
Olive oil is the most unsaturated fat among the options provided, being composed mostly of monounsaturated fats which are liquid at room temperature. Butter and lard contain higher levels of saturated fats, which are solid at room temperature, while waxes are not triglycerides.
Step-by-step explanation:
Out of the options provided (a) Butter, (b) Lard, (c) Wax, and (d) Olive Oil, olive oil is the most unsaturated fat. Olive oil is mostly composed of monounsaturated fat, which has just one double bond in each fatty acid molecule. This single double bond gives olive oil its liquid state at room temperature. In contrast, butter and lard are high in saturated fats, which are solid at room temperature due to their carbon chains consisting entirely of single bonds. Waxes are also not considered unsaturated fats, as they are generally long-chain alcohols and not triglycerides like the other substances listed.
Unsaturated fats are usually of plant origin and contain carbon-carbon double bonds, which create a bend or a "kink" that keeps them liquid at room temperature. These fats, including olive oil, canola oil, and corn oil, help to improve blood cholesterol levels and are considered healthier compared to saturated fats, which might contribute to plaque formation in the arteries.