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: jim drove 768 miles of a 1200 miles journey . how many more miles does he need to drive to finish his journey ?
Options: a ) 432 miles , b ) 651 miles , c ) 387 miles , d ) 954 miles , e ) 556 miles
Example Output: a

Example Input: Problem: eddy and freddy start simultaneously from city a and they travel to city b and city c respectively . eddy takes 3 hours and freddy takes 4 hours to complete the journey . if the distance between city a and city b is 570 kms and city a and city c is 300 kms . what is the ratio of their average speed of travel ? ( eddy : freddy )
Options: a ) 8 / 3 , b ) 3 / 8 , c ) 38 / 15 , d ) 5 / 8 , e ) 5 / 3
Example Output: c

Example Input: Problem: the sum of two consecutive integers is 21 . find the numbers .
Options: a ) 17 , 18 , b ) 7 , 8 , c ) 10 , 11 , d ) 1 , 2 , e ) 8 , 9
Example Output:
c