In an oxygen cutting job, what is the greatest safety hazard?

In an oxygen cutting job, the greatest safety hazard is indeed the stream of sparks and molten metal generated during the process. This hazard is significant because the intense heat produced can lead to fires and injuries if proper precautions are not taken. The sparks can travel considerable distances, igniting flammable materials in the vicinity and causing serious harm to personnel and equipment.

While the other options present valuable safety concerns, such as risk of asphyxiation from poor ventilation or exposure to harmful fumes, the immediate threat posed by the flying sparks and molten metal is particularly pronounced. Workers must be diligent in wearing appropriate protective gear, maintaining a safe workspace, and ensuring proper fire safety measures are in place to mitigate such hazards. The dynamic and expansive nature of the sparks in conjunction with the work environment elevates the risk associated with these hazards above others in the context of oxygen cutting jobs.