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: on my sister ' s birthday , she was 132 cm in height , having grown 10 % since the year before . how tall was she the previous year ? 
Options: a ) 130 cm , b ) 126 cm , c ) 120 cm , d ) 116 cm , e ) 112 cm
Example Output: c

Example Input: Problem: a cube of side two meter length is cut into small cubes of side 10 cm each . how many such small cubes can be obtained ? 
Options: a ) 2878 , b ) 2778 , c ) 1000 , d ) 8000 , e ) 8900
Example Output: d

Example Input: Problem: there is enough provisions for 600 men in an army camp for 25 days . if there were 100 men less , how long will the provision last ? 
Options: a ) 10 days , b ) 50 days , c ) 100 days , d ) 150 days , e ) 200 days
Example Output:
d