After Remaining Flat for More Than Two Decades, Oil Prices

After remaining flat for more than two decades, oil prices began to rise in the year 2000 because

A) OPEC renewed its embargo.
B) the bursting of the Internet bubble in the U.S. led investors to buy energy stocks.
C) consumption was increasing so dramatically in India and China.
D) new environmental regulations made production of oil more costly.
E) people began to realize that oil would eventually run out.