This year a new oil field with substantial reserves has been discovered. Such discoveries are not made every year. Therefore an increase in the demand for oil will?

ensure that the short-run price of oil remains unchanged.

ensure that the short-run price of oil falls.

increase the long-run price of oil more than the short-run price of oil.

ensure the long-run price of oil and short-run price of oil increase by the same amount.

increase the long-run price of oil less than the short-run price of oil.