Dr. Rubeus is studying how teenagers think about high school by asking them to answer several questions related to their classroom experiences. It is most likely that Dr. Rubeus’s research involves a(n) method.

The correct answer to the following question will be "Self-report".

Explanation:

A self-report would be any form through which a person is asked regarding their certain thoughts, behaviors, values and many more.Types of self-reports include interviews and considerations; they are often used in observational studies and research as just a means of gaining input from the respondents and it is much more possible that this approach is used in the work of Dr. Rubeus.

Therefore, it's the right answer.

Hope this will !