What Does the Research Suggest About Major Depression and Combat

What does the research suggest about major depression and combat experience?

A) The chance of being diagnosed with major depression is related to the number of deployments, regardless of whether combat was involved.
B) The chance of being diagnosed with major depression decreases with combat exposure.
C) The chance of being diagnosed with major depression increases with combat exposure.
D) The chance of being diagnosed with major depression increases for men, but not for women, with combat exposure.