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: if a randomly selected positive single digit multiple of 3 is multiplied by a randomly selected prime number less than 20, what is the probability w that this product will be a multiple of 45 ?
Options: a. 1 / 32, b. 1 / 28, c. 1 / 24, d. 1 / 16, e. 1 / 14
[A]: c


[Q]: Problem: a ( 3, w ^ 3 ) is the ( x, y ) coordinate of point located on the parabola y = x ^ 2 - 1. what is the value of w ?
Options: a. 2., b. 4., c. 5., d. 6., e. 9.
[A]: a


[Q]: Problem: a collection of books went on sale, and 2 / 3 of them were sold for $ 2.25 each. if none of the 40 remaining books were sold, what was the total amount received for the books that were sold ?
Options: a. $ 160, b. $ 150, c. $ 280, d. $ 200, e. $ 180
[A]:
e