The United States Imports About 40 Percent of Its Oil

The United States imports about 40 percent of its oil, despite its own massive reserves because:

A) Americans consume more than what they can produce.
B) Americans reroute their imported oil to other nations at a higher cost.
C) the quality of oil produced in their reserves is substandard.
D) the quantity of oil produced in their reserves is negligible.
E) it is cheaper to export import oil than to extract it from the oil reserves.