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.

Input: Consider Input: Problem: if the wages of 6 men for 15 days be rs. 2100, then find the wages of for 12 days.
Options: a. rs. 2420, b. rs. 2500, c. rs. 2520, d. rs. 2020, e. rs. 2650

Output: c


Input: Consider Input: Problem: the product of two positive integers is 675 and their difference is 2. what is the bigger number ?
Options: a. 21, b. 23, c. 25, d. 27, e. 29

Output: d


Input: Consider Input: Problem: carl can wash all the windows of his house in 6 hours. his wife maggie can wash all the windows in 6 hours. how many hours will it take for both of them working together to wash all the windows ?
Options: a. 2, b. 2 1 / 4, c. 3, d. 4 1 / 2, e. 5


Output: c