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: a rectangular tiled patio is composed of 96 square tiles. the rectangular patio will be rearranged so that there will be 2 fewer columns of tiles and 4 more rows of tiles. after the change in layout, the patio will still have 96 tiles, and it will still be rectangular. how many rows are in the tile patio before the change in layout ?
Options: a. 5, b. 6, c. 8, d. 13, e. 28
Example Output: c

Example Input: Problem: find the sum of first 89 odd numbers
Options: a. 7921, b. 4800, c. 7900, d. 4980, e. 4960
Example Output: a

Example Input: Problem: what is 2 2 / 3 - 1 1 / 4 divided by 1 / 2 - 1 / 4 ?
Options: a. 17 / 36, b. 36 / 17, c. 17 / 6, d. 17 / 3, e. 51 / 4
Example Output:
d