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: a man traveled from the village to the post - office at the rate of 25 kmph and walked back at the rate of 4 kmph. if the whole journey took 5 hours 48 minutes, find the distance of the post - office from the village ?
Options: a. 70 m, b. 80 km, c. 20 km, d. 10 km, e. 73 km

Output: c


Input: Consider Input: Problem: dhoni bought 5 toys with the average cost of $ 10. if david also buys the sixth toy with the price of $ 16, what is the average ( arithmetic mean ) price of those 6 toys ?
Options: a. $ 10, b. $ 7, c. $ 8.5, d. $ 9, e. $ 11

Output: e


Input: Consider Input: Problem: a rectangular box of volume v has width, depth and height in the ratio of 2: 1: 3 ( in that order ). what is the height as a function of v ?
Options: ['a. ( v / 2 ) ^ ( 1 / 3 )', 'b. ( 2 v / 6 ) ^ ( 1 / 3 )', 'c. ( 9 v / 2 ) ^ ( 1 / 3 )', 'd. ( 4 v / 3 ) ^ ( 1 / 3 )', 'e. ( 4 v / 2 ) ^ ( 1 / 3 )']


Output: c