On October 29, 1989, Alex Agrees to Paint Georgia's House

On October 29, 1989, Alex agrees to paint Georgia's house during the Thanksgiving week for $4,000 in exchange for Georgia's promise to pay him $4,000 in cash immediately upon completion of the work. Which of the following statements is true of this case?

A) Georgia could hire another painter on October 31 without legal liability to Alex because until he has painted the house, he has not given any consideration for Georgia's promise to hire him.
B) Alex could back out of the deal on October 31 without legal liability to Georgia because she has not given any consideration for Alex's promise to do the work until she pays him.
C) Both parties are bound on October 29 because each has given consideration for the other's promise.
D) Alex could back out of the deal on October 29 without legal liability if he could prove that $4,000 was inadequate consideration to paint Georgia's house.