Bob Sees a Used Car Advertised as Having 65,000 Miles

Bob sees a used car advertised as having 65,000 miles on it,the same as the odometer shows.Bob has the car inspected by a mechanic who says,"I think this car actually has about 100,000 miles on it,but it is in excellent condition." Frank buys the car and the engine fails a month later.Based on this,Frank:

A) cannot avoid the contract on the basis of fraud
B) can avoid the contract on the basis of unilateral mistake
C) can avoid the contract on the basis of undue influence due to the incorrect mileage
D) can recover from the mechanic on the basis of fraud