Which of the following statements is true of the preliminary hypotheses about the interaction that causes vulnerability to disease?

A) Stressful experiences increase the efficiency of the immune system.
B) Stressful situations make individuals more susceptible to diseases.
C) Stressful experiences cause the deactivation of dormant viruses.
D) Stress directly promotes disease-fighting processes.

The statement that "stressful situations make individuals more susceptible to diseases" is true of the preliminary hypotheses about the interaction that causes vulnerability to disease. This idea is known as the stress-disease model and suggests that chronic stress can weaken immune function, making individuals more susceptible to infection and disease. None of the other statements are supported by current research.