I'm not sure if I am doing this correctly please help. Please show the formulas and any calculations that you do I'm really confused. Thank you so much I really appreciate it!

For each of the following characteristics, say whether it describes a perfectly competitive or monopolistic competitive firm, both or neither. A. Has a marginal revenue less than price. B. Produces the socially efficient level of output. C. Makes zero economic profit in the long run. D. There is excess capacity