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: an industrial loom weaves 0.128 metres of cloth every second. approximately, how many seconds will it take for the loom to weave 25 metre of cloth ?
Options: a. 194 seconds, b. 195 seconds, c. 196 seconds, d. 197 seconds, e. none of these
Example Output: b

Example Input: Problem: a certain roller coaster has 6 cars, and a passenger is equally likely to ride in any 1 of the 6 cars each time that passenger rides the roller coaster. if a certain passenger is to ride the roller coaster 6 times, what is the probability that the passenger will ride in each of the 6 cars ?
Options: a. 3 / 1944, b. 1 / 96, c. 2 / 96, d. 1 / 1944, e. 1
Example Output: a

Example Input: Problem: the average ( arithmetic mean ) of 8 numbers is 43.1. if the sum of half of these numbers is 158.4, what is the average of the other half ?
Options: a. 12.8, b. 24.2, c. 46.6, d. 72.1, e. 96.8
Example Output:
c