Which of the following best describes a firm offer: Either party can revoke at any time. It is revocable for lack of consideration during the stated time or. if no lime is slated, for reasonable time not to exceed six months. It is an offer given to a merchant to purchase a firm quantity of goods for a period of up months. ft is an offer made by a merchant not revocable for lack of consideration during the time or. if no time is stated, for a reasonable time not to exceed three months