10. Its main purpose is to observe, describe and document aspects of a situation as it naturally occurs and sometimes to serve as a starting point for hypothesis generation
or theory development.

"Descriptive research designs" is the correct approach.

Explanation:

A descriptive research design would have to use a broad range of study approaches or methodologies to analyze one or more parameters and quantities. The investigator doesn't somehow manipulate or manage or alter some of the other factors, and then only monitors and tests them, unlike in laboratory research.