Which of the following explains why a natural monopoly has a negatively sloped long-run average total cost curve? Select a Choice Below current question choices OptionA A natural monopoly confronts economies of scale over the entire range of its output demanded in its industry. OptionB A natural monopoly experiences economies of scale only at low levels of output. OptionC A natural monopoly experiences diseconomies of scale at higher levels of output. OptionD A natural monopoly experiences diseconomies of scale if new firms enter the market