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: p has $ 32 more than what q and r together would have had if both b and c had 1 / 6 of what p has. how much does p have ?
Options: a. $ 44, b. $ 48, c. $ 52, d. $ 56, e. $ 60
Example Output: b

Example Input: Problem: what is the probability of getting a queen or spade from a set of cards ?
Options: a. 3 / 13, b. 4 / 13, c. 5 / 13, d. 6 / 13, e. 7 / 13
Example Output: b

Example Input: Problem: an aeroplane covers a certain distance of 670 kmph in 6 hours. to cover the same distance in 6 1 / 4 hours, it must travel at a speed of
Options: a. 440, b. 540, c. 643, d. 740, e. 250
Example Output:
c