The common sign of cinemas, shopping malls, hospitals and other public places is () A.B.C.D

A, it is a sign of no smoking, and it often appears in public places such as shopping malls and hospitals. Therefore, the option is correct; B, it is forbidden to put flammable materials, and it is not often seen in public places such as shopping malls and hospitals. Therefore, the option is wrong; C. It is forbidden to set off fireworks and firecrackers, which is not common in public places such as shopping malls and hospitals. Therefore, the option is wrong; D, beware of fire, which is not common in public places such as shopping malls and hospitals. Therefore, the option is wrong. Therefore, choose a.