Final answer:
The offer will end in the scenario where the sale of the object of the offer is made to someone other than the original offeree. This is because the object in question can no longer be provided to the original offeree, hence terminating the offer. option b.
Step-by-step explanation:
One of the scenarios that will cause an offer to end is 'B) the expiration of a reasonable time if the offeror did not specify that the offer would end at a definite time or upon the happening of a specific event'. In contract law, an offer can be terminated on various grounds. An option contract (mentioned in A) is a separate agreement in which the offeree pays for the right to keep the offer open for a specified period, thus it does not terminate the original offer. Scenario C) does not result in the termination of the offer before the specified time of 5:00 p.m. Scenario D) indicates that the sale of the object of the offer to another party would terminate the offer since the object can no longer be sold to the original offeree. Finally, E) is incorrect as once an offer has been accepted, it cannot be revoked; the obligation becomes binding at that point.