Answer:
C) Follow the instructions for toner replacement to replace the toner in this Series 400 copier.
Explanation:
If you really want to know if the manual instructions are correct and they are written in a such a way that a typical user can follow them, then you should try to see if they perform a regular task by following the manual's instructions.
Finding the instructions is one thing, but it doesn't mean that the instructions are correct or easy to follow.