challenge: In Masaccio's 'The Tribute Money', where does the scene of Peter paying the tax collector take place?
  
  A. In the middle background, where Peter takes the money out of the mouth of the fish
  B. In the central scene, where the tax collector demands the tribute
  C. At the right, set apart by the framework of an architectural structure
  D. At the left hand part of the painting, where Christ and the disciples are gathered
  Answer: 