The best definition of an experiment is a. a standardized scientific procedure for conducting investigations b. the identical treatment of participants in two groups to determine the effect of a dependent variable on an independent variable c. a systematic recording of behavior exhibited by participants in the laboratory d. a carefully controlled scientific procedure that determines whether variables manipulated by the experimenter have a causal effect on other variables

The correct answer will be option-D

Explanation:

The experiment plays an important role in the investigation which represents the scientific procedure performed in the controlled conditions.

The experiment is performed to test whether the proposed hypothesis can be proved or not proved.  

Since the hypothesis contains the variables to be tested which could be independent and dependent which are tested in controlled experiments therefore, option-D is the correct answer.

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;

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