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

How to deal with a tooth pulling
Look for signs of tooth problems.
If you start to feel pain in your mouth, it could be the sign of a serious condition, which may lead to your teeth being pulled. Possible reasons for pulling a tooth include :
Your mouth is crowded.

Select from:
A). There may be pieces of food stuck in the enamel. You have difficulty swallowing or breathing, and you tend to grind your teeth, grinding the food into you teeth.;
B). Sometimes you will need a tooth removed to help keep your teeth properly aligned. They may be too big for your mouth, or their current position prevents a new one from breaking in.;
C). You constantly have food or drink in your mouth. You use the wrong mouthwash and toothpaste.;
D). It's painful to bite into your gums, particularly if you aren't biting for fun. This condition, known as periodontitis, can be difficult to treat.;
The answer is:
B).