Control groups provide a baseline for an experimental investigation. Thus, the correct option is B.
What is an Experimental investigation?
An experimental investigation may be defined as a complete set of methodology that involves the active modification of certain variables in order to test a hypothesis and gather documented evidence to support the claim.
During an experimental investigation, a hypothesis is a previously occupied knowledge that requires complete sets of evidence. While independent and dependent are variables that should be modified in order to reveal the outcome.
Control groups are those standard values or ideas that assist the experimental study of one variable at a time irrespective of any external influences.
Therefore, the correct option for this question is B.
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