What document must be prominently displayed according to regulations?

The FTC Buyer's Guide is a document that must be prominently displayed according to regulations, particularly in the context of vehicle sales. This guide serves to inform potential buyers about their rights and protections when purchasing a vehicle, providing critical information about the vehicle's condition, warranty coverage, and any potential costs they may encounter with the purchase.

The intent behind requiring the display of the Buyer's Guide is to promote transparency and trust in the sales process, ensuring that consumers are well-informed before making a significant financial decision. By offering details about the responsibilities of both the seller and the buyer, the guide helps create a more equitable marketplace.

While the other options may provide useful information in their own contexts, they are not mandated for display in the same manner as the Buyer’s Guide. The FTC Seller's Handbook focuses on the regulatory framework for sellers rather than consumer protection, the Vehicle Safety Report pertains to safety assessments which are typically required but not in the same consumer-oriented context, and the Motor Vehicle Sales Agreement is a contractual document that finalizes the sale and does not necessarily need to be displayed openly.