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: how many prime numbers are between 29 / 3 and 87 / 6 ?
Options: a. 1, b. 2, c. 3, d. 4, e. 5

Output: b


Input: Consider Input: Problem: a person buys an article at $ 600. at what price should he sell the article so as to make a profit of 8 % ?
Options: a. 670, b. 689, c. 648, d. 740, e. 889

Output: c


Input: Consider Input: Problem: a store reduced the price of all items in the store by 12 % on the first day and by another 10 % on the second day. the price of items on the second day was what percent of the price before the first reduction took place ?
Options: a. 80.0, b. 79.2, c. 81.0, d. 81.1, e. 81.9


Output: b