Final answer:
When heated, olive oil becomes less viscous as the increased temperature allows the oil's molecules to move faster and more freely, making it flow more easily.
Step-by-step explanation:
If the cup of olive oil is heated, the expected outcome would be that it becomes less viscous. Viscosity is a measure of a fluid's resistance to flow and generally decreases as temperature increases.
When olive oil is heated, the increase in temperature provides more energy to the molecules, which move faster and slide past each other more easily, thereby reducing viscosity. So, the correct answer to what would happen when olive oil is heated is (D) It becomes less viscous.