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: a store reported total sales of $ 460 million for february of this year. if the total sales for the same month last year was $ 320 million, approximately what was the percent increase in sales ?
Options: a. 2 %, b. 17 %, c. 44 %, d. 65 %, e. 83 %

Ex Output:
c


Ex Input:
Problem: a person ' s present age is two - fifth of the age of his mother. after 8 years, he will be one - half of the age of his mother. how old is the mother at present
Options: a. 38, b. 40, c. 42, d. 44, e. 45

Ex Output:
b


Ex Input:
Problem: a man engaged a servant on the condition that he would pay him rs. 500 and a uniform after one year service. he served only for 9 months and received uniform and rs. 300, find the price of the uniform ?
Options: a. s. 80, b. s. 85, c. s. 90, d. s. 300, e. s. 120

Ex Output:

d