Task: Question Answering
Input (English): Question: A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. If the area of the field is 680 sq. feet, how many feet of fencing will be required?

 Option A: 34

 Option B: 40

 Option C: 68

 Option D: 88

 Option E: 78
Output (English): Option D