What does a control group show in an experimental investigation?

the effects that the scientists are causing by manipulating variables

how nature would act without manipulation by the researchers

why each part of a system is related to every other part

all parts of a system that scientists are controlling and changing

The control group, receiving no intervention, is used as a baseline to compare groups and assess the effect of that intervention.

The control group in an experimental investigation shows how nature would act without manipulation by the researchers.

Answer: Option B

Explanation:

The control group, a separated group from the rest of all other scientific experiments. The work done by this group does not affect the results of the actual experiment. The significant work of this group is to analyse the independent variables and their influence on the experiment. The control group is also classified as positive group and negative group.

The work of positive group is to check whether the independent variables were affecting the other parameters in a positive way to get the desired results. While the negative group composes the constraints to be followed by the investigators to get the desired results. Thus the control group shows how nature would act without manipulation by the researchers.