Aerosol cans use compressed gases to propel the contents out of the can which of the following is the best explanation for why aerosol cans should not be overheated

Well the answer is pretty brief.

Aerosol cans should not be overheated because of the chemicals that is in the cans, and if the cans get too hot, they can explode. Depending on what is in the can, you do not want to get chemical/spray everywhere.