Royal Properties, Inc. mails flyers to hundreds of firms, advertising that it can sell prefrabricated buildings for $75,000.Standard Manufacturing Company responds to the ad in writing, saying "We accept your offer."Between the two companies, there is

a. A valid and enforceable contract for the sale of the building

b. A right of first refusal to consider the offer before any others

c. Merely a solication by Royal Properties for an offer and no enforceable contract until Royal Properties accepts

d. A contractual requirement to negotiate the sale of the building in good faith and finish a contract