Write the next sentence in the following story.

How to practice mosh pit etiquette
Know when moshing is appropriate.
At many concerts mosh pits will not be allowed and will be dispelled as quickly as they form. If you are asked to stop moshing, then stop.

Select from:
[a]. Moshing can be violent, so it is important not to discontinue. If moshing is permitted, stop moshing for a minute so no one can notice the problem..
[b]. Warn others that you will be moshing. You can mark, say, next time, especially if it's a more casual event..
[c]. Start in a way that lets people get out of the way if they prefer. Starting a mosh pit is probably the most dangerous part of moshing because people can be caught off guard and/or find themselves in the mosh pit against their will..
[d]. If you are asked to stop too soon, let the other person continue. After the mosh pit is end, ask what everyone should do... The answer should be
[c].