And now I can’t find my keys

Why should a laser printer toner cartridge remain in the bag until it’s replaced?

A) The OPC drum could be damaged

B) The toner will evaporate

C) Toner can easily spill out of the cartridge

D) Toner has a limited shelf life when exposed to air

E) There are many small parts that can be lost

F) I’ll misplace any loose items