Three types of fish populate a lake. Researchers conducting a study want to know which type is most common in the lake. They send teams to different locations on the lake to catch, tag, and release as many fish as possible. What is the sample in this study?

A.
All fish in the lake

B.
All fish caught in the lake during the study period

C.
Fish that are caught and tagged by the research teams

D.
The type of fish with the greatest number