Question

where should materials never be stacked or stored?
o on pallets
o outdoors
o in cabinets
o on scaffolds

Explanation:

Scaffolds are temporary structures for construction - related work and not meant for long - term or regular material storage as it can pose safety risks like collapse due to overloading and obstruct work processes. Pallets, outdoors (in some cases with proper protection), and cabinets can be used for material storage under appropriate conditions.

Answer:

D. on scaffolds