TASK DEFINITION: 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.
PROBLEM: Problem: how many positive even integers less than 100 contain digits 5 or 7 ?
Options: a. 10, b. 17, c. 18, d. 19, e. 20

SOLUTION: a

PROBLEM: Problem: a 16 % stock yielding 10 % is quoted at :
Options: a. 83.33, b. 110, c. 112, d. 120, e. 160

SOLUTION: e

PROBLEM: Problem: if m is a positive integer and m ^ 2 is divisible by 24, then the largest positive integer that must divide m is ?
Options: a. 3, b. 6, c. 8, d. 12, e. 16

SOLUTION:
c