A Group of Researchers Are Studying Depression in a Sample

Multiple Choice

A group of researchers are studying depression in a sample of patients. Each researcher independently assesses the level of depression in each patient, but their assessments do not match. The problem with the research is that:

A) depression cannot be studied scientifically.
B) the researchers do not have an objective measure of depression.
C) there are too many researchers.
D) the patients are not really depressed.