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: in an electric circuit , two resistors with resistances 3 ohm and 5 ohm are connected in parallel . in this case , if r is the combined resistance of these two resistors , then the reciprocal of r is equal to the sum of the reciprocals of two resistors . what is the value ? 
Options: ['a ) 15 ohms', 'b ) 15 / 8 ohms', 'c ) 1 / 8 ohms', 'd ) 8 / 15 ohms', 'e ) 8 ohms']

Ex Output:
b


Ex Input:
Problem: a rectangular lawn of length 200 m by 120 m has two roads running along its center , one along the length and the other along the width . if the width of the roads is 5 m what is the area covered by the two roads ? 
Options: ['a ) 400', 'b ) 1550', 'c ) 1575', 'd ) 1600', 'e ) 1625']

Ex Output:
c


Ex Input:
Problem: approximately how many cubic feet of water are needed to fill a circular swimming pool that is 40 feet across and 7 feet deep ? 
Options: a ) 700 , b ) 1500 , c ) 3000 , d ) 5000 , e ) 9000

Ex Output:

e