Fact Pattern 7-2 Hester Offers to Sell Her House to Frank for $250,000

Fact Pattern 7-2
Hester offers to sell her house to Frank for $250,000. Frank says that he would like to think about it, and Hester says that is fine. The next day, Martha, Hester's friend, says that she will give Hester $240,000 for the house. Hester really likes Martha more than Frank and signs a contract to sell the house to Martha. Later that day Hester sees Frank walking up her driveway. She immediately opens the window and yells "I revoke the offer on the house" before Frank says anything. Frank replies that he accepts the offer and expects to purchase the home. Frank tells Hester that while he has not yet taken steps to sell his own home or get a loan, he feels confident that there will be no problem with those matters and he is a ready, willing, and able buyer.
-Refer to fact pattern 7-2. Which of the following is true regarding the offer to Frank assuming Hester's revocation was ineffective?

A) The offer was probably still open the next day because a reasonable length of time would not have expired.
B) The offer would have terminated because Frank did not provide any consideration to leave it open.
C) By operation of law, it would have terminated at midnight on the day it was made.
D) By operation of law, it would still have been open because it would not have terminated until midnight on the day after it was made.