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: john and david can finish a job together in 2 hours. if john can do the job by himself in 3 hours, what percent of the job does david do ?
Options: a. 36.33 %, b. 33.33 %, c. 39.33 %, d. 40.33 %, e. 33 %

Output: b


Input: Consider Input: Problem: the overall age of x and y is 19 year greater than the overall age of y and z. z is how many decades younger that x ?
Options: a. 11, b. 15, c. 12, d. 19, e. 20

Output: d


Input: Consider Input: Problem: convert the 1 / 3 m / s into kilometers per hour ?
Options: a. 2.9 kmph, b. 9.9 kmph, c. 1.3 kmph, d. 1.2 kmph, e. 5.7 kmph


Output: d