Which of the following options is not a valid seller response to an offer?

In the context of real estate offers, a seller has specific options on how to respond to an offer made by a potential buyer. The options of acceptance, rejection, and negotiation are all valid responses because they represent proactive engagement with the offer.

Accepting the offer indicates that the seller agrees to the terms presented and is ready to finalize the transaction. Rejecting the offer means the seller is not interested in proceeding with the terms laid out and is signaling that to the buyer. Negotiating represents a middle ground where the seller seeks to modify certain terms of the offer to better align with their interests.

Ignoring the offer, however, is not a valid or recognized response in the context of contractual negotiations. It suggests inaction, which does not facilitate any closure on the offer and can lead to misunderstandings or complications in the transaction process. Valid interactions in real estate transactions require clear communication of intent, and ignoring an offer does not fulfill this necessity. Therefore, it is important for sellers to respond actively rather than leaving an offer unaddressed.