The Concept of Control Is Important in Psychological Research Because

The concept of control is important in psychological research because

A) without control over independent and dependent variables,researchers cannot describe,predict,or explain behavior.
B) experimental control allows researchers to study the influence of one or two independent variables on a dependent variable while holding other potential influences constant.
C) without experimental control,results cannot be generalized from a sample to a population.
D) of all of these reasons.