The greatest factor in the link between stress and illness appears to be

A) inability to eat.
B) the change in heart rhythms.
C) the activation of the immune system.
D) interference with sleep.

Link Between Stress

The connection or relationship between stressors (psychological or physical) and their impact on an individual's mental or physical health.

Immune System

The body's defense system composed of organs, tissues, cells, and molecules that work together to protect the body against diseases and other potentially damaging foreign bodies.