Instructions: 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: Problem: how much is 80 % of 45 is greater than 4 / 5 of 25 ?
Options: a. 15, b. 57, c. 16, d. 16, e. 73
Output:
c