Answer:
d. a separate contract is created for the limited purpose of keeping the offer open
Step-by-step explanation:
The contract defines that it is a contract between two or more persons in which the legal agreement, offers acceptance by the offeree is there and thus it is a lawful contract which is created by mutual agreement between the parties.
If the offeree offers the offeror some value in return for a commitment not to withdraw the offer for a given period of time, a contract option was established. A choice is a separate contract with the specific intention of holding the offer open.