Ted's wallet is as empty as his bank account, and he needs 3500 immediately. Fortunately, he has ...

Ted's wallet is as empty as his bank account, and he needs 3500 immediately. Fortunately, he has three gold coins that he inherited from his grandfather. Each is worth 2500, but it is Sunday, and the local rare coins store is closed. When approached, Ted's neighbor Andrea agrees to buy the first coin for 2300 . Another neighbor, Cami, agrees to buy the second for 1100 . A final neighbor, Lorne, offers all the money I have on me - 100  for the last coin. Desperate, Ted agrees to the proposal. Which of the deals is supported by consideration?
 a. Ted's agreement with Andrea, only
  b. Ted's agreements with Andrea and Cami, only
  c. All three of the agreements
  d. None of the agreements