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.

Example Input: Problem: what is the smallest number which, when increased by 7, is divisible by 8, 11, and 24 ?
Options: a. 264, b. 257, c. 269, d. 270, e. 282
Example Output: b

Example Input: Problem: if a man lost 8 % by selling oranges at the rate of 25 a rupee at how many a rupee must he sell them to gain 25 % ?
Options: a. 20, b. 15, c. 18.4, d. 20, e. 12.8
Example Output: c

Example Input: Problem: right now, the ratio between the ages of sandy and molly is 4: 3. after 6 years, sandy ' s age will be 66 years. what is molly ' s age right now ?
Options: a. 15 years, b. 35 years, c. 25 years, d. 45 years, e. 55 years
Example Output:
d