Coal Is an Input in the Production of Oil

Multiple Choice

Coal is an input in the production of oil. Suppose that over the last 3 months, the price of oil has increased and the quantity sold of oil has fallen. Other things remaining the same, which of the following is most likely to be true?

A) There was a decrease in the demand for oil.
B) Coal miners received large wage increases.
C) Coal producers installed more efficient coal mining equipment.
D) New mine operators entered the coal industry.
E) New firms entered the market for oil.