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

A: d
****
Q: Problem: a company produces 50000 bottles of water everyday. if a case can hold 25 bottles of water. how many cases are required by the company to hold its one day production
Options: a. 2000, b. 4500, c. 5000, d. 8000, e. 9000

A: a
****
Q: Problem: a man swims downstream 96 km and upstream 64 km taking 4 hours each time; what is the speed of the current ?
Options: a. 6, b. 4, c. 2, d. 8, e. 5

A:
b
****