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According to the observational study, Option C is the correct answer which represent the The researcher does not control or change the population.

According to the statement

we have to explain all about the observational studies.

So, For this purpose, we know that the

Observational study means a kind of study within which individuals are observed or certain outcomes are measured.

And from the given information:

There are three major sorts of statistical studies: observational studies, surveys, and experiments.

▫ An observational study records the values of variables for members of a sample.

▫ A survey could be a sort of observational study that gathers data by asking people variety of questions.

In Option C we are provided that in a very survey Data are collected a few population which require not be true.

Thus, According to the observational study, Option C is the correct answer which represent the The researcher does not control or change the population.

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