A group of students are investigating how many earthworms occupy a given volume of soil. This is a descriptive investigation. So the correct option is D.
What is a descriptive investigation?
Descriptive investigations describe the various characteristics of an area, population, ecosystem etc that is under study.
Descriptive investigations do not relate to the cause, time and reason for a phenomenon to occur. It just provides information about the current state of a phenomenon.
It includes quantitative information about a phenomenon obtained via quantitative methods of investigation.
Therefore, a study where a group of students are investigating how many earthworms occupy a given volume of soil is a descriptive investigation.
Therefore the correct option is D.
Read more about investigation methods, here
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