If we were interested in studying the effect of drug abuse on employment we would probably use a(n) study because of ethical issues involved in employing random assignment.

Correlational Study.

Explanation:

According to my research on different types of research methodology, I can say that based on the information provided within the question the best type of study that we can use in this situation would be a Correlational Study. This is a study that examines two different variables and observes how a change in one affects the other. In this situation the two variables would be drug abuse and employment.

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answer; /// i believe that the correct answer is (d); /// alternate walking and running;