It’s great fun the first three times.

Why should a spare laser printer toner cartridge be kept in its bag until it is needed for a replacement?

A) The toner particles become “stale” when oxygen is present

B) Toner cartridges contain a timer that begins when the package is opened

C) The toner cartridge contains light-sensitive materials

D) Toner cartridges are sensitive to changes in altitude

E) When opened, the cartridge jumps out and yells “SURPRISE!”