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.

Ex Input:
Problem: a train traveled the first d miles of its journey it an average speed of 50 miles per hour, the next d miles of its journey at an average speed of y miles per hour, and the final d miles of its journey at an average speed of 160 miles per hour. if the train ’ s average speed over the total distance was 96 miles per hour, what is the value of y ?
Options: a. 68, b. 84, c. 90, d. 120, e. 160

Ex Output:
e


Ex Input:
Problem: what is the perimeter of a square field whose diagonal is 8 â ˆ š 2 ?
Options: a. 64 m, b. 32 m, c. 30 m, d. 16 m, e. 18 m

Ex Output:
b


Ex Input:
Problem: a rectangular farm has to be fenced one long side, one short side and the diagonal. if the cost of fencing is rs. 14 per meter. the area of farm is 1200 m 2 and the short side is 30 m long. how much would the job cost ?
Options: a. 1276, b. 1680, c. 2832, d. 1299, e. 1236

Ex Output:

b