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 train which has 430 m long, is running 45 kmph. in what time will it cross a person moving at 9 kmph in same direction ?
Options: a. 56 sec, b. 43 sec, c. 36 sec, d. 29 sec., e. 19 sec.
Example Output: b

Example Input: Problem: if x and y are positive integers and 3 + x + y + xy = 17, what is the value of x + y ?
Options: a. 3, b. 5, c. 6, d. 8, e. 9
Example Output: c

Example Input: Problem: a caterer ordered 125 ice - cream bars and 125 sundaes. if the total price was $ 225.00 and the price of each ice - cream bar was $ 0.60, what was the price of each sundae ?
Options: a. $ 0.60, b. $ 0.80, c. $ 1.00, d. $ 1.20, e. $ 1.60
Example Output:
d