Answer:
d. Yes, the offeror must be a merchant, pursuant to the UCC definition of merchant.
Explanation:
The Uniform Commercial Code (UCC) establishes that firm offers can only be made by merchants. They also apply only to the sale of goods, but the baseball card is a type of good.
The problem is that Debbie is not probably a merchant. In order for her to be considered a merchant, she would need to be in the business of buying and selling baseball cards on a regular basis.