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

Example Input: Problem: the width of a rectangular hall is ½ of its length . if the area of the hall is 128 sq . m , what is the difference between its length and breadth ? 
Options: a ) 8 m , b ) 10 m , c ) 12 m , d ) 15 m , e ) 17 m
Example Output: a

Example Input: Problem: if the sum of a number and its square is 72 , what is the number ? 
Options: a ) 15 , b ) 26 , c ) 8 , d ) 91 , e ) none of these
Example Output: c

Example Input: Problem: the area of sector of a circle whose radius is 12 metro and whose angle at the center is 54 â ° is ? 
Options: a ) 52.6 , b ) 52.9 , c ) 67.9 , d ) 52.1 , e ) 52.2
Example Output:
c