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: if teena is driving at 55 miles per hour and is currently 7.5 miles behind loe , who is driving at 40 miles per hour in the same direction then in how many minutes will teena be 15 miles ahead of loe ?
Options: a ) 15 , b ) 60 , c ) 75 , d ) 90 , e ) 105

Ex Output:
d

Ex Input:
Problem: walking with 5 / 4 of my usual speed , i miss the bus by 5 minutes . what is my usual time ?
Options: a ) 18 , b ) 19 , c ) 20 , d ) 22 , e ) 24

Ex Output:
c

Ex Input:
Problem: a and b can do a piece of work in 16 days , b and c in 24 days , c and a in 12 days . how long will c take to do it ?
Options: a ) 16 days , b ) 55 days , c ) 24 days , d ) 32 days , e ) 22 days

Ex Output:
d