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: michelle deposited a certain sum of money in a savings account on july 1 st, 2007. she earns an 14 % interest compounded semiannually. the sum of money in the account on december 31 st, 2009 is approximately what percent of the initial deposit ?
Options: a. 117 %, b. 120 %, c. 121 %, d. 138 %, e. 145 %
Example Output: d

Example Input: Problem: heinz produces tomato puree by boiling tomato juice. the tomato puree has only 20 % water while the tomato juice has 90 % water. how many liters of tomato puree will be obtained from 25 litres of tomato juice ?
Options: a. 2.8 liters., b. 3.125 liters., c. 8.5 liters., d. 2.6 liters., e. 2.1 liters.
Example Output: b

Example Input: Problem: a random 10 - letter code is to be formed using the letters a, b, c, d, e, f, g, h, i and i ( only the “ i ” will be used twice.. what is the probability that a code that has the two i ’ s adjacent to one another will be formed ?
Options: a. 1 / 10, b. 1 / 8, c. 1 / 5, d. 1 / 4, e. 1 / 2
Example Output:
c