To determine the minimum distance that a spoil pile must be located from the edge of an excavation, we need to compare the given options and identify the smallest distance.
Let's analyze the options provided:
1. Option OA: 100 yards. When converted to meters, this distance is 91.4 meters.
2. Option OB: 2 feet. When converted to meters, this distance is 0.61 meters or 61 centimeters.
3. Option OC: 6 inches. When converted to meters, this distance is 0.15 meters or 15 centimeters.
4. Option OD: 5 feet. When converted to meters, this distance is 1.5 meters.
Now, we compare the distances:
- 91.4 meters (Option OA)
- 0.61 meters (Option OB)
- 0.15 meters (Option OC)
- 1.5 meters (Option OD)
Among the given options, 0.15 meters (Option OC) is clearly the smallest distance.
Therefore, the minimum distance that a spoil pile must be located from the edge of an excavation is Option OC: 6 inches (15 cm).