Dr Lampert Wants to Know How College Students Tend to Flirt

Dr. Lampert wants to know how college students tend to flirt with each other, so he sits in the college cafeteria and pretends to be doing a crossword puzzle. In fact, he's listening to the conversations of nearby students and is taking notes when he observes flirtations taking place. Dr. Lampert has chosen a __________ research method.

A) case study
B) naturalistic observation
C) controlled experiment
D) Survey