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'.

Ex Input:
Problem: how many paying stones , each measuring 2 m * 2 m are required to pave a rectangular court yard 30 m long and 18 m board ? 
Options: a ) 99 , b ) 18 , c ) 135 , d ) 17 , e ) 12

Ex Output:
c


Ex Input:
Problem: a courtyard is 25 meter long and 16 meter board is to be paved with bricks of dimensions 20 cm by 10 cm . the total number of bricks required is 
Options: a ) 16000 , b ) 18000 , c ) 20000 , d ) 22000 , e ) 24000

Ex Output:
c


Ex Input:
Problem: a can give b 300 meters start and c 600 meters start in a kilometer race . how much start can b give c in a kilometer race ? 
Options: a ) 111.12 , b ) 111.67 , c ) 428.57 , d ) 111.11 , e ) 101.12

Ex Output:

c