This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to clean a muzzleloader
Make sure the firearm is unloaded.
You can do this by pulling back the bolt of the gun and checking for a ball and powder, or tilting the gun forward at a 45 degree angle. If you're using a traditional muzzleloader ball as ammunition, it will roll out the front of the barrel.

Available choices:
(A). Never try to look down the barrel to see if there is a ball and powder in the firearm. Attempting to clean any type of loaded gun could result in serious injury or death.
(B). Cock the trigger to eject the muzzleloader ball. Tightening the trigger is not always necessary and may result in wasted ammunition.
(C). The sight should hang over the edge of the barrel, so it is easier to clean. This means there should be no screw/bolt in the front, just a slot about the length of the book cover in front of the receiver.
(D). The nearly universal way to clean a muzzleloader ball is to wipe it down using a stiff-bristled brush. Many people hate to take a bristle brush.
The answer is:
(A).