What should Broker A do with respect to the two offers received for Seller B's house?

Presenting both offers to the seller as soon as possible is the correct course of action for Broker A. In real estate practice, a broker has a fiduciary duty to act in the best interest of their client, in this case, Seller B. This includes providing the seller with all relevant information about offers received, allowing them to make an informed decision on how to proceed.

By presenting both offers, Broker A ensures that Seller B can evaluate the options available and choose the one that aligns best with their objectives, whether that’s a higher price, fewer contingencies, or a faster closing. The broker must not make unilateral decisions about which offer to entertain or reject without the seller's explicit consent.

Choosing to reject the lower offer without consultation limits the seller’s options and could lead to missing out on a potentially acceptable offer, especially if market conditions are volatile. Consulting with the buyer of the cash offer involves engaging with a third party, which is not necessary at this stage since the focus should be on what the seller decides. Finally, informing the buyers about each other's offers could breach confidentiality and trust, potentially harming the broker's relationship with the clients involved.