Brown Offered to Sell Wilson an Air Conditioner for $300

Brown offered to sell Wilson an air conditioner for $300. When Wilson said he needed time to think about the offer, Brown said that he would keep the offer open for five days. Which of the following statements is correct?

A) Brown may not withdraw the offer until the end of the fifth day.
B) Brown may withdraw the offer at any time before acceptance is made.
C) Brown's agreement to keep the offer open created an option to purchase the air conditioner.
D) Brown may not withdraw his offer without Wilson's consent.