A Group of Scientists Suspects That Certain Dietary Practices Are

Multiple Choice

A group of scientists suspects that certain dietary practices are partially responsible for different rates of hypertension among adults of different ethnic/racial groups.To test their hypothesis,the researchers examine data concerning the different population groups' hypertension rates and their past dietary practices.This research is a ________ study.

A) retrospective
B) case-control
C) prospective
D) hypothetical