Question

what should be ensured before attempting to lift any material? ensure the stacking ratio is no greater than 3:1 use a safety harness look for any protruding nails, wires, or sharp edges

Explanation:

Before lifting materials, safety is crucial. Checking for protruding nails, wires, or sharp edges prevents injuries during the lifting process. A stacking ratio (related to storage stability) and safety harness (for fall protection in certain heights, not general material - lifting) are not as directly relevant as inspecting the material's surface for hazards before lifting.

Answer:

look for any protruding nails, wires, or sharp edges