The scenario is an observational study, done by the teacher.
The correct option is (B)
<h3>What is Observational study?</h3>
Firstly, A type of study in which individuals are observed or certain outcomes are measured. No attempt is made to affect the outcome.
Survey is defined as the act of examining a process or questioning a selected sample of individuals to obtain data about a service, product, or process.
Experimental research, also called experimentation, is research conducted using a scientific approach using two or more variables.
If we look at the question, the teacher was trying to do the observational study. By observing the students answer.
Learn more about Observational Study here:
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