Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus in a given day?

A) An experiment.
B) A survey.
C) Direct observation.
D) None of these choices.

This scenario involves direct observation, since the researcher is physically observing and recording data about the students wearing backpacks on campus. It is not an experiment, as there is no manipulation of variables, and it is not a survey, as the researcher is not asking the students for their input or opinions.