Which of the Following Was an Unlikely Factor That Contributed

Which of the following was an unlikely factor that contributed to a spectacular increase in oil prices and volatility in the new millennium?

A) A new kind of trader,a commodity index trader,increased activity in the commodity markets.
B) A new kind of trader,a swap dealer,increased activity in the commodity markets.
C) Day traders increased their trading activity in the spot oil market through exchange-traded funds.
D) Lax regulatory oversight allowed many speculators to trade and destabilize energy markets.
E) Demand from emerging economies and production squeezes.