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.
--------
Question: Problem: what is the smallest number by which 2880 must be divided in order to make it into a perfect square ?
Options: a. 3, b. 4, c. 5, d. 6, e. 7

Answer: c

Question: Problem: if the range q of the 6 numbers 4, 314, 710 and x is 12, what is the difference between the greatest possible value of x and least possible value of x ?
Options: a. 0, b. 2, c. 12, d. 13, e. 15

Answer: d

Question: Problem: if x / 2 = y / 5 = z / 6, then ( x + y + z ) / x is equal to :
Options: a. 13, b. 12, c. 15 / 2, d. 13 / 2, e. none of these

Answer:
d