What safety equipment is essential for workers on excavation sites?

The correct choice emphasizes the importance of using hard hats, safety boots, and high-visibility vests at excavation sites. Hard hats are crucial for protecting workers from head injuries caused by falling objects, which are a common hazard in excavation areas. Safety boots provide necessary foot protection from heavy equipment and sharp objects typically found on these sites, helping to prevent injuries due to crush incidents or punctures. High-visibility vests ensure that workers are easily seen, which is vital for safety, especially when operating near moving vehicles or machinery.

Together, these items create a fundamental layer of protection against the unique dangers present during excavation work, helping to ensure the overall safety and well-being of the workers on site. Other safety gear, such as reflective jackets or specific protective devices like gloves and masks, may be beneficial in certain conditions but do not universally address the critical risks associated with excavation work as comprehensively as the selected answer does.