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: i flew my tiny seaplane to visit my mother. on the flight up, i flew at 96 mph. on the way home, i flew 88 mph. what was my average speed for the trip ?
Options: a. 198 mph, b. 110 mph, c. 92 mph, d. 100 mph, e. 99 mph

Output: c


Input: Consider Input: Problem: if price of t. v set is reduced by 20 %, then its sale increases by 80 %, find net effect on sale value
Options: a. 44, b. 45, c. 46, d. 47, e. 48

Output: a


Input: Consider Input: Problem: what ratio must a shopkeepermix peas and soybean of rs. 16 and rs. 25 / kg, as to obtain a mixture of rs. 19.50 ?
Options: a. 10: 7, b. 9: 8, c. 11: 7, d. 13: 11, e. 14: 8


Output: c