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: what is the total number of integers between 10 and 50 that are divisible by 2 ?
Options: a. 18, b. 19, c. 22, d. 25, e. 10

Output: b


Input: Consider Input: Problem: what is the value of n if the sum of the consecutive odd intergers y from 1 to n equals 169 ?
Options: a. 47, b. 25, c. 37, d. 33, e. 29

Output: b


Input: Consider Input: Problem: a customer went to a shop and paid a total of $ 40, out of which $ 1.28 was for sales tax on taxable purchases. if the tax rate was 8 %, then what was the cost of the tax free items ?
Options: a. $ 19.54, b. $ 2076, c. $ 21.36, d. $ 22.72, e. $ 23.58


Output: d