B) is false, because monopolist will choose MR=MC, not P=MC??

For C), I don't fully understand why this is TRUE. Can someone please explain it by showing me a graph?

A4. Demand faced by a monopolist is Q = 20 0.5P. Her marginal cost is 10. Based on this information we can say that: (a) The optimal production of the monopolist is Q =35. l: (b) The price charged by the monopolist is equal to her marginal cost. \"F fl @ The deadweight loss associated with the monopolist's choice of price is less than the " product of the difference between her price and marginal cost, multiplied by her optimal quantity. FT