B
(without the control you won't know what a normal result would be without the independent variable).
the answer here would be c!!!
A.) neutral
If the protein structure does not change then the function will not be affected either. The resulting effect is neutral because the shape and function was not altered.
The answer is methods of observation. Observational Methods in mental research involve the perception and portrayal of a subject's conduct. Scientists using the observational technique can apply fluctuating measures of control over the earth in which the perception happens.