In which situations does OSHA require the use of a 5-point safety harness?

The correct choice highlights that OSHA requires the use of a 5-point safety harness in situations involving confined spaces and rooftops primarily due to the inherent risks associated with these environments.

When working in confined spaces, workers may face hazards such as falling from significant heights, losing consciousness due to limited oxygen, or exposure to harmful substances. The 5-point safety harness is essential as it provides a secure means of protecting individuals against falls, which can result in serious injuries or fatalities.

On rooftops, the risk of falling from heights is markedly increased, making the use of fall protection systems not just advisable but often mandatory under OSHA regulations. The 5-point harness, when properly used, ensures that workers remain secured and can be safely rescued if an emergency arises. The necessary identification of these specific scenarios helps in enforcing safety standards and protecting workers' lives.

Other scenarios listed either do not inherently require a harness or have different safety protocols that do not involve the same level of fall risk as confined spaces and rooftops do.