Final answer:
To properly discharge a fire extinguisher, it should be held in an upright position ensuring the extinguishing agent flows correctly.
Step-by-step explanation:
When preparing to discharge a fire extinguisher to put out a fire, it is essential to hold the extinguisher in the correct position for it to work effectively. The correct position to hold a fire extinguisher when discharging it is c) Upright. Holding the extinguisher upright ensures that it works properly, as the extinguishing agent can flow through the extinguisher and out the nozzle as intended to combat the fire.