Martin Offered to Buy a Property for $200 000,"offer to Remain

Multiple Choice

Martin offered to buy a property for $200 000,"offer to remain open until 5:00 p.m.on Thursday,January 21." Which one of the following situations will not cause the offer to end?

A) a counter-offer from the offeree
B) death of the offeror
C) insanity of the offeror before the offer is accepted
D) Martin sells the property to another party before the expiration of the period stipulated and before hearing from the offeree
E) the offeree has not accepted and the stipulated time has expired