Anmool Verbally Agreed to Build a Deck for Nikki for $1,000

Anmool verbally agreed to build a deck for Nikki for $1,000 by the 15th of September, in time for a lavish backyard barbecue she was planning. On September 13th, 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 $1,000; 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 $1,200, because that is what she agreed to, and such contracts are binding.
C) Nikki does not owe Anmool anything, because his lack of professionalism vitiated the contract.
D) Problems of consideration can be raised only in the commercial context, not when the parties involved are both individuals.
E) No legal obligations arise because the agreement is not in writing.