Anmool Verbally Agreed to Build a Deck for Nikki for $1000

Anmool verbally agreed to build a deck for Nikki for $1000 by the September 15,in time for a lavish backyard barbecue she was planning.On September 13,Nikki became concerned at Anmool's lack of progress.Anmool told Nikki he would complete the deck on time,for an additional $200.Nikki agreed and Anmool completed the deck on time.Which of the following is correct?

A) Nikki owes Anmool $1000; there is no binding obligation with respect to the additional $200 because Anmool had an existing duty to complete the deck on time.
B) Nikki owes Anmool $1200, because that is what she agreed to, and such contracts are binding.
C) Problems of consideration can be raised only in the commercial context, not when the parties involved are both individuals.
D) Nikki does not owe Anmool anything, because his lack of professionalism vitiated the contract.
E) No legal obligations arise because the agreement is not in writing.