Teacher: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.
Teacher: Now, understand the problem? Solve this instance: 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
Student:
d