If the empty weight of a B-III semi-portable CO2 fire extinguisher is 35 lbs (15.9 kg), what is its full charged weight?

Correct Answer: Option D — 70 lbs (31.7 kg)

A B-III semi-portable CO2 extinguisher has a rated capacity of 35 lbs of extinguishing agent. Since the empty weight is 35 lbs, the total charged weight is the sum of the agent and the cylinder, totaling 70 lbs, which is the standard weight for this specific classification.