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: in a group of 100 people, 90 have an age of more 30 years, and the others have an age of less than 20 years. if a person is selected at random from this group, what is the probability the person ' s age is less than 20 ?
Options: a. 0.1, b. 0.55, c. 0.65, d. 0.75, e. 0.85

Output: a


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: there are 5 chess amateurs playing in villa ' s chess club tournament. if each chess amateur plays with exactly 8 other amateurs, what is the total number of chess games possible to be played in the tournament ?
Options: a. 10, b. 20, c. 40, d. 60, e. 120


Output: b