Mr Goode, a Neighbour of Your Parents, Offered to Sell

Mr. Goode, a neighbour of your parents, offered to sell you his house for $200,000, a bit below market value. You are definitely interested but would like to see if your employment contract will be renewed and to check about financing. Mr. Goode says that he'll hold the offer open for you until May 1, 2011. On these facts, which of the following is false?

A) Mr. Goode will be bound to hold it open if you offer and he accepts your offer to wash his car every Saturday morning for two months in exchange for his promise to hold it open.
B) Mr. Goode's promise to hold it open is sufficient; the offer is safe until May 1, 2011, when it will expire.
C) Mr. Goode will be bound to hold it open if you pay him and he accepts some money to hold it open until that date.
D) If you buy an option to buy a house, you still don't have to buy the house.
E) Mr. Goode will be bound to hold it open until that date if his promise to do so was written and under seal.