What Is the Meaning of "Control" in a Study with an Experimental

What is the meaning of "control" in a study with an experimental design?

A) The care taken to ensure maintenance of participant confidentiality
B) The introduction of one or more constants into the experimental situation
C) The ability of the researcher to prevent data collection from extending beyond the original time specified for the study
D) The faithfulness of the researcher in the application of all the assumptions of the experimental process to the study

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