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 is to be fenced on three sides leaving a side of 20 feet uncovered . if the area of the field is 440 sq . feet , how many feet of fencing will be required ? 
Options: a ) 34 , b ) 40 , c ) 64 , d ) 88 , e ) 92

Ex Output:
c


Ex Input:
Problem: approximately how many cubic feet of water are needed to fill a circular swimming pool that is 70 feet across and 9 feet deep ? 
Options: ['a ) 4000', 'b ) 10000', 'c ) 20000', 'd ) 35000', 'e ) 45000']

Ex Output:
d


Ex Input:
Problem: the volume of a certain substance is always directly proportional to its weight . if 48 cubic inches of the substance weigh 112 ounces , what is the volume , in cubic inches , of 56 ounces of this substance ? 
Options: a ) 27 , b ) 36 , c ) 42 , d ) 24 , e ) 147

Ex Output:

d