Answer:
b. a written, signed offer by anyone to buy or sell goods.
Step-by-step explanation:
Under the provisions of Article 2 of Uniform commercial code, whenever a merchant as defined by the act, signs a written document whereby he promises to buy or sell goods, such an offer gives rise to a firm offer which cannot be revoked.
The three important conditions for an offer to be termed as a firm offer would be, the agreement must be in writing and secondly, it must be signed by the party and most importantly it must state a promise to perform an act of buying/selling.