The Most Important Advantage of Experiments Over Observational Studies Is

Multiple Choice

The most important advantage of experiments over observational studies is

A) experiments are usually easier to carry out.
B) a well-designed experiment can give good evidence that the treatments actually cause the response.
C) an experiment can compare two or more groups.
D) we can use randomization to avoid bias in designing an experiment.
E) we can study the relationship between two or more explanatory variables.