What form did Agatha help Rufus complete for his purchase offer?

The correct answer is the sales contract. This form is essential in real estate transactions as it outlines the specifics of the purchase agreement between the buyer and seller. A sales contract includes critical details such as the purchase price, property description, closing date, and any contingencies that must be met for the sale to go through. By assisting Rufus in completing this form, Agatha ensures that his offer is formally presented to the seller, thereby initiating the sales process.

While the other choices represent important documents in real estate, they serve different purposes. A buyer representation agreement establishes the relationship between a buyer and a broker, detailing the broker's obligations to the buyer. A listing agreement is between a seller and a broker, granting the broker permission to market the property. A promissory note is a loan document, outlining the borrower's promise to pay back borrowed funds but is not directly related to making an offer on a property. Hence, the sales contract is the appropriate form for Rufus's purchase offer.