This method is used during an oil spill because the oil vapors are volatile. booms skimmers dispersants burning

The correct option is BURNING.
IN SITU BURNING is an oil spill response method which involved the controlled burning of the oil at or near the spill site on the surface of the water. When use early in a spill before the oil releases its volatile components, burning has the capacity to remove oil from the surface of the water in an efficient manner and at a very high rate. Burning reduces the oil spill into carbon dioxide and water.