Can someone help me with this question?

Compare a situation of market competition, monopoly, and monopoly with first-degree price discrimination on a single graph. Assume that the firms are maximizing profits. Assume that the supply curve for the competitors is the same as the marginal cost curve for the monopoly situations.

The demand curve is

P = 200 - Q.

The Supply curve for competitors is P =2 Q and the marginal cost (MC) curve for the monopolists is

MC = 2Q. The total cost (TC) function is TC = Q2.