An incumbent's absolute cost advantage over a potential new entrant can act as a barrier to entry in the following circumstance: A) The price of the product, which is fixed (i.e. cannot be changed), is lower than the value that a consumer derives from the product B) The price of the product, which is fixed (i.e. cannot be changed), is higher than the new entrant's per-unit cost C) The price of the product, which is fixed (i.e. cannot be changed), is higher than the government-regulated price of a similar product D) The price of the product, which is not fixed (i.e. can be changed), is higher than the new entrant's per-unit cost