Which of the Following Is NOT a Key Aspect of the Classic

Which of the following is NOT a key aspect of the classic experiment incorporation of manipulative control?

A) Individuals are randomly assigned to treatment and control groups.
B) The two groups are treated the same in all respects except for the presence or absence of the independent variable.
C) the elimination of rival plausible explanation through analytical control
D) Use appropriate statistical tests to see whether any differences we observe are greater than we would expect based on chance variation alone.