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: 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
Example Output: d

Example Input: Problem: j is faster than p. j and p each walk 24 km. sum ofthe speeds of j and p is 7 kmph. sum of time taken by them is 14 hours. then j speed is equal to ?
Options: a. 4, b. 5, c. 6, d. 7, e. 8
Example Output: a

Example Input: Problem: there were two candidates in an election. winner candidate received 62 % of votes and won the election by 384 votes. find the number of votes casted to the winning candidate ?
Options: a. 288, b. 744, c. 992, d. 298, e. 177
Example Output:
c