Which of the following most logically completes the passage?
Oil producers get a high price for their oil when market supply is low. But the price drops sharply when oil supplies are abundant. Thus, in high-output years, some oil producers keep oil stockpiles for one or two years, hoping to sell at higher prices in the future. This year's market supply of oil was the lowest in five years. It is nonetheless quite possible that a portion of this year's oil production will be stored into stockpiles, since _____________ .