​_______ may help explain why stress can lead to depression.

A) ​Increased cytokine production
B) ​Decreased cytokine production
C) ​Increased T-cell production
D) ​Increased activity of natural killer cells

Cytokine Production

The process by which cells, often immune, produce and release cytokines, which are signaling molecules that mediate and regulate immunity, inflammation, and hematopoiesis.

Depression

A mood disorder characterized by persistent feelings of sadness, hopelessness, and a lack of interest or pleasure in activities.