Which of these is a valid criticism of the research on mood disturbance or stress and subsequent cancer diagnoses?

Question

Quizplus · Accepted Answer

All of the given options are valid criticisms of the research on mood disturbance or stress and subsequent cancer diagnoses. Cancer symptoms may have preceded the reported stress or mood disturbance, sample sizes are often small, and other risk factors and mediating social supports are not always controlled for. These limitations make it difficult to draw definitive conclusions about the relationship between mood disturbance or stress and cancer diagnosis.

Which of These Is a Valid Criticism of the Research