In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Ex Input:
Problem: a rectangular field has 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 ? 
Options: ['a ) 80 feet', 'b ) 85 feet', 'c ) 83 feet', 'd ) 88 feet', 'e ) 90 feet']

Ex Output:
d


Ex Input:
Problem: the length of a rectangular field is 7 / 5 its width . if the perimeter of the field is 336 meters , what is the width of the field ? 
Options: a ) 50 , b ) 60 , c ) 70 , d ) 80 , e ) 90

Ex Output:
c


Ex Input:
Problem: the volume of a cube is 1000 cc . find its surface . 
Options: a ) 864 , b ) 556 , c ) 255 , d ) 600 , e ) 267

Ex Output:

d