Why Is the World Unlikely to Ever Literally Run Out

Multiple Choice

Why is the world unlikely to ever literally run out of oil?

A) There is an unlimited supply of oil.
B) As the cheap-to-produce oil gets used up, the price of oil will rise, encouraging conservation and production using more expensive techniques.
C) The demand for oil is not very high.
D) As the demand for oil increases, the quantity supplied increases as well.