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: a shopkeeper sold 30 articles at the cost price of 35 articles. then find the profit % or lost %
Options: a. 12 %, b. 15 %, c. 16.67 %, d. 18 %, e. 22 %
[EX A]: c

[EX Q]: Problem: how many multiples of 4 are there between 12 and 104, inclusive ?
Options: a. 21, b. 22, c. 23, d. 24, e. 25
[EX A]: d

[EX Q]: Problem: the average of 10 numbers is 0. in those 10, at the least, how many may be greater than or equal to zero ?
Options: a. 0, b. 1, c. 2, d. 3, e. 5
[EX A]:
b