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'.

Input: Consider Input: Problem: a swimmer can swim in still water at 4 km / h . if the speed of the water current is 2 km / h , how many hours will the swimmer take to swim against the current for 5 km ?
Options: a ) 2.0 , b ) 2.5 , c ) 3.0 , d ) 3.5 , e ) 4.0

Output: b

Input: Consider Input: Problem: if an object travels at eight feet per second , how many feet does it travel in one hour ?
Options: a ) 34880 , b ) 3778 , c ) 12788 , d ) 18000 , e ) 28800

Output: e

Input: Consider Input: Problem: the radius of a wheel is 20 cm . what is the distance covered by the wheel in making 500 resolutions ?
Options: a ) 708 m , b ) 704 m , c ) 314.3 m , d ) 714 m , e ) 744 m
Output: c