When conducting an experiment to evaluate treatment methods, researchers compare the effectiveness of the independent variable applied to the to the results found in the

The researchers compare the effectiveness of the independent variable applied to the sample and to the results found in the research.

Explanation:

In order to devise how effective the independent variable is and to what extent is it affecting the sample, the researchers opt to do a direct comparison between the attributes of the two. This comparison culminates in providing the researchers with the knowledge on to what extent the result of the study is manipulated or controlled by the independent variable.

Ithink it's c selection but i don't really know.