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 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
[EX A]: b

[EX Q]: Problem: if two dice are thrown together, the probability of getting an even prime number on the dice is
Options: a. 1 / 36, b. 1 / 18, c. 1 / 13, d. 1 / 9, e. 5 / 36
[EX A]: a

[EX Q]: Problem: if x represents the product of the first 15 positive integers, then x is not a multiple of :
Options: a. a. 99, b. b. 84, c. c. 72, d. d. 57, e. e. 67
[EX A]:
d