Discussion
The process coning and quartering is used in the evaluation of :
Answer: C
The key gives soil.
Coning and quartering is a way to reduce a bulk granular sample to a small, representative portion. The material is heaped into a cone, flattened, divided into four, and two opposite quarters are rejected; the rest is mixed and the process repeated. Soil samples collected at a scene or in the field are reduced this way before analysis.
Glass and paint are examined as fragments or flakes and are not reduced by this method.
What could not be confirmed: the same method is used for ores and mineral powders, so 'minerals' is also a fair answer in general chemistry. In a forensic setting soil is the usual example, and that is the reading the key takes.
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