Dr. adams found that when people eat high fat diets, they are diagnosed with depression at a higher rate. this is an example of research

The correct answer is correlational research. Correlational research is described as a non-experimental research method by which the researches uses this method applies the use of measuring two variables that understands and also assess the statistical relationship with having no extraneous variable to be involved.

if im not mistaken its a. collective emotional arousal