BondsRUs Is a Broker-Dealer That (Unsurprisingly) Specializes in Bonds

BondsRUs is a broker-dealer that (unsurprisingly) specializes in bonds. The firm has found that it is able to sell Treasury bonds that it buys for $90 per $100 of par value for $99 per $100 of par value to some of its more naïve clients, who never pay attention to the confirmation statements BondsRUs sends them. BondsRUs is guilty of

A) nothing. It is acting as a dealer in bonds and, as such, can charge its clients whatever the clients are willing to pay.
B) overcharging its clients by unreasonable markups. A $9 dealer's spread on Treasury bonds is unwarranted.
C) fraud.
D) both B and C.