Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Ex Input:
Problem: if the range q of the 6 numbers 4, 314, 710 and x is 12, what is the difference between the greatest possible value of x and least possible value of x ?
Options: a. 0, b. 2, c. 12, d. 13, e. 15

Ex Output:
d


Ex Input:
Problem: an 80 - liter solution of cool - drink is made from 10 % jasmine water. if 5 liters of jasmine and 15 liters of water were added to the solution, what percent of the solution is jasmine ?
Options: a. 11 %, b. 13 %, c. 15 %, d. 17 %, e. 19 %

Ex Output:
b


Ex Input:
Problem: in my, xiang sold 15 used cars. for these 15 used cars the range of selling prices was 15000 and the lowest selling price was 4500. in june, xiang sold 10 cars. for these 10 cars the range of selling was 16000 and the lowest selling price was 5000. what was the range of selling prices for the 25 used car sold by xiang in may and june ?
Options: a. 15,600, b. 15,750, c. 16,820, d. 18,100, e. 19,200

Ex Output:

c