What happens if the grounding system of an arc welder fails?

When the grounding system of an arc welder fails, it poses significant safety risks. A properly functioning grounding system is crucial for preventing electrical hazards. If the grounding is compromised, the welder and any associated equipment may become energized. This condition can increase the risk of electric shock for the operator and anyone nearby, leading to severe injuries or even fatalities. Additionally, without an effective grounding system, electrical surges or faults may not be directed safely to the ground, further elevating the risk of fire or equipment damage. Therefore, option B accurately highlights the dangers that arise from a failure in the grounding system of an arc welder.