Final answer:
Scree is the best example of a product of mass wasting, as it represents the accumulation of rock fragments at the base of slopes due to gravitational movement.
Step-by-step explanation:
The best example of a product of mass wasting is scree. Mass wasting refers to the downslope movement of rock and soil due to gravity. Examples of mass wasting include landslides, rockfalls, and the accumulation of fallen rock fragments at the base of cliffs or steep slopes, commonly referred to as scree.
Other choices such as limestone, faults, exfoliation domes, and sandstone monoliths relate to geological formations, tectonic activities, or the result of weathering and erosion, but not specifically to the immediate product of mass wasting like scree, which is a direct accumulation of debris due to gravitational movement without any transportation by water, ice, or wind.