Question

which type of investigation usually includes multiple groups being examined?
descriptive investigation
comparative investigation
experimental investigation

Explanation:

Descriptive investigation focuses on describing a single - group or phenomenon. Comparative investigation involves examining and comparing multiple groups to identify differences and similarities. Experimental investigation has an experimental group and a control group, but its main focus is on the effect of a variable, not always multiple groups for comparison in the same sense as comparative investigation.

Answer:

B. Comparative investigation