Suppose chuck, a car salesman, writes a letter to bethany on december 1 about the sale of a used bmw on the lot. the letter says, "i have a used bmw z8 that i will sell to you anytime between now and december 31 for $106,000. the offer is irrevocable until that date." chuck's letter is an example of what legal concept?
a. finance lease.
b. firm offer.
c. written requirement of contract.
d. consumer lease.
e. unconscionability.