Answer:
The answer is C.
Explanation:
Soil testing refers to the analysis of soil samples, in order to determine a number of things, which include nutrient availability, mineral composition, the organic matter present in the soil, etc. It is also a very important diagnostic tool for ascertaining the nutrient requirements of plants.
When carrying out soil testing on a particular site, samples are taken from different locations from the site, this includes different depths as well. This is done in order to give a general picture of what the soil on the site looks like.
