In a Research Study,subjects in One Group Decrease Their Intake

In a research study,subjects in one group decrease their intake of saturated fat and cholesterol,and those in a control group maintain their current level of intake for 2 years,with regular monitoring of risk factors for cardiovascular disease.This type of research study is called a(n)

A) case study.
B) epidemiologic study.
C) monitoring study.
D) experimental study.

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