A broker signed a listing agreement with the Ghents to market their luxury downtown condominium. A few days later, the broker signed a buyer representation agreement with the Smiths, who were looking for a modest suburban single$-$family home. If the buyers decide they're in the market for a luxury downtown condominium instead and want to see the Ghents' property, what should the broker do$?$

A$.$ Say nothing and collect a commission from the sellers and a fee from the buyers.

B$.$ Disclose the unintended dual agency and obtain both parties' written consent.

C$.$ Withdraw from representing one of the parties to avoid any appearance of selfdealing.

D$.$ Nothing, but accept compensation from only one of the parties.