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.

[Q]: 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
[A]: b


[Q]: Problem: how many quarters are equal to 7 dollars ?
Options: a. 1, b. 28, c. 12, d. 9, e. 7
[A]: b


[Q]: Problem: a student chose a number, multiplied it by 2, then subtracted 138 from the result and got 112. what was the number he chose ?
Options: a. 123, b. 267, c. 125, d. 267, e. 120
[A]:
c