To address the requirement for correct placement of materials and equipment with respect to the edge of an excavation, let's analyze the possible distances given in the options:
A. 6 inches (15 cm)
B. 1 foot (30 cm)
C. 2 feet (60 cm)
D. 4 feet (1.2 m)
For safety and to avoid accidental falls of materials or equipment into the excavation, a safe distance is essential. After careful consideration, the recommended distance is:
C. 2 feet (60 cm)
Thus, the correct answer is that materials and equipment should be placed no closer than 2 feet (60 cm) from the edge of an excavation.
