Final answer:
Saturated fats are linked to heart disease due to their ability to raise LDL cholesterol levels and are solid at room temperature; unsaturated fats like those in olive oil are liquid and beneficial to heart health.
Step-by-step explanation:
The correct answer to the question is D. It is linked to heart disease. Saturated fats are known for being solid at room temperature due to the absence of double bonds in their fatty acid chains, which allows them to pack tightly together. They are mostly found in animal products and some plant oils such as coconut oil. The consumption of a diet high in saturated fats is associated with an increased risk of heart disease because it can increase LDL ("bad") cholesterol levels in the blood. In contrast, unsaturated fats, which include monounsaturated and polyunsaturated fats, are liquid at room temperature and are found in oils like olive oil, canola oil, and others. These fats contain one or more double bonds, which introduce kinks in the fatty acid chains, preventing them from packing tightly and remaining liquid at room temperature. Unsaturated fats have been associated with lower risks of heart disease.