The research method that should Dr. Steinberg uses to draw this conclusion is the experimental method.
The research methods may be defined as the process of detailed techniques for accumulating and interpreting data in a precise manner.
The four types of research methods are observational, experimental, simulation, and derived.
The most important method of accumulating inquisitions in the field of science is the Experimental method. This method has the ability to control and maintain variables as per your need.
It is utilized to estimate and designate a reasonable relationship between the cause and effect method.
The complete question is as follows:
Therefore, the correct option for this question is D, i.e. experimental method.
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