Which Statement Best Summarizes the Findings of Bruce Alexander and His

Multiple Choice

Which statement best summarizes the findings of Bruce Alexander and his colleagues on the effects of external environment on drug addiction in rats?

A) The external environment has no influence on drug addiction.
B) The external environment has a significant effect on biopsychological variables related to addiction.
C) Rats that lived in the Rat Park demonstrated increased preference for addictive drugs.
D) Exercise causes a rat to increase its preference for addictive drugs.