Answer:
B)The cost of energy for a company can be both a fixed cost and a variable cost.
Explanation:
Energy is a fixed cost because it is an utility that companies have to pay regardless of the level of production; they need energy to function.
Energy is a variable cost because energy is an input to production, and the amount of energy used (and hence its cost) can vary a lot depending on how much output is produced. In the question, ethanol is referenced, which is also a type of variable cost, because it is an energy source that depends on another input (corn), and its used as a substitue for gasoline.