A Monopoly ________ Make Positive Economic Profit in the Long

A monopoly ________ make positive economic profit in the long run because ________.

A) can;barriers to entry prevent other firms from entering the market and sharing the profit
B) cannot;eventually demand will decrease and prices will fall
C) cannot;other firms will enter the market until all firms are making zero economic profit
D) can;new technology constantly lowers costs for the monopoly firm and for its competitors
E) can;demand constantly increases and price constantly rises