Both the definitions of clean and dirty prices provided by Anderson are incorrect. The clean price of a Treasury bond is the quoted price, not the sum of the quoted price and the accrued interest. It can also be calculated as the dirty price minus the accrued interest since the last coupon date. On the other hand, the dirty price of a Treasury bond is the sum of the quoted price and the accrued interest, not the clean price minus the accrued interest. The dirty price is the total amount that a buyer pays to the seller, including the price of the bond and the interest that has accrued since the last coupon payment. Therefore, both statements made by Anderson are inconsistent with the standard definitions of clean and dirty prices in the context of Treasury bonds.

Choice A is incorrect. The definition of the clean price is indeed incorrect, but this choice does not account for the fact that the definition of dirty price is also incorrect. The clean price of a bond does not include accrued interest; it refers to the price of a bond excluding any interest that has accrued since issue or last coupon payment.

Choice B is incorrect. While it's true that Anderson's definition of dirty price is wrong, this option doesn't acknowledge her erroneous explanation about clean prices. Dirty prices do include accrued interest, contrary to what Anderson stated.

Choice D is incorrect. Both definitions provided by Anderson are inconsistent with standard definitions in finance literature and practice. Therefore, it cannot be said that none of the definitions are incorrect.