CAL OSHA regulates confined spaces in which location?

The correct answer indicates that CAL OSHA regulates confined spaces only in California. It is important to understand that CAL OSHA represents the California Division of Occupational Safety and Health, which specifically develops regulations and standards to protect workers' safety and health within the state. While OSHA (the Occupational Safety and Health Administration) sets federal safety standards that can apply nationally, CAL OSHA’s regulations are tailored to address the unique needs and conditions present in California workplaces.

This state-specific jurisdiction allows CAL OSHA to enforce rules and provide guidelines that may differ from those laid out by federal OSHA, particularly in terms of local hazards and labor conditions, ensuring that California workers receive protection that's suited to their specific environments. In contrast, the other options would imply that CAL OSHA's regulations extend beyond California, which is not the case.