It should be noted that using scientific method, Researchers use this approach to avoid bias in experiments.
According to this question, we are required to discuss about scientific method, and how it is been used by researcher.
As a result of this we can see that Researchers use this approach to avoid bias in experiments, because a scientific method helps to reach conclusion.
Therefore, D is correct because Researchers use this approach to avoid bias in experiments..
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I dont have a source but what i can tell you is that the rome was a very powerful empire that took over a lot for its own benefit especially in its economic ways .
A contract is a signed agreement