Done Right Roofing installed a roof and gutters on Dortmond's home, but used the wrong gutters. The gutters and installation constituted only a sixth of the total cost of the job. Now the Dortmond's maintain they will not pay anything for the job. The best route for Done Right Roofing to pursue is:
O failure of conditions
O substantial performance
O mistake
O misrepresentation
O none of the above