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

Example Input: Problem: p , q and r can do a work in 6 , 9 and 12 days respectively . they completed the work and got rs . 195 . what is the share of p ? 
Options: a ) 80 , b ) 70 , c ) 85 , d ) 90 , e ) 95
Example Output: d

Example Input: Problem: 28 buckets of water fill a tank when the capacity of each bucket is 13.5 litres . how many buckets will be required to fill the same tank if the capacity of each bucket is 9 litres ? 
Options: a ) 30 , b ) 42 , c ) 60 , d ) data inadequate , e ) none of these
Example Output: b

Example Input: Problem: carl can wash all the windows of his house in 6 hours . his wife maggie can wash all the windows in 7 hours . how many hours will it take for both of them working together to wash all the windows ? 
Options: a ) 2 , b ) 2 1 / 4 , c ) 42 3 / 3 , d ) 4 1 / 2 , e ) 5
Example Output:
c