If history information becomes material after the Wisconsin Buyer's Guide has been completed, what should be done?

Answer: B — Inform the buyer and disclose the information

When history information becomes material, it is important to inform the buyer and disclose the information to them. This is the ethical and responsible thing to do, as the buyer has the right to know all relevant information about the vehicle they are purchasing. Amending the Wisconsin Buyer's Guide would only be necessary if incorrect or incomplete information was originally provided. Doing nothing and continuing with the sale without disclosing the new information can lead to legal and ethical issues. Removing the vehicle from sale may also be necessary in extreme cases, but the preferred course of action would be to inform the buyer and allow them to make an informed decision.