Answer and Explanation:
Experimental research is the preferred method for answering questions about cause and effect because it is able to show if there is a cause-and-effect relationship between the variables. It is a rigorous method in which one variable is manipulated in order to determine the effect on the dependent variable. The result is observed and, from it, the researcher can tell if the manipulated variable did indeed have an effect over the dependent variable. This type of research can be conducted in laboratories or field settings.