With Regard to Stress and Disease,​

With regard to stress and disease,​

A) ​executives are more likely than middle-level managers are to develop diseases associated with stress.
B) ​stress can affect disease development directly through the immune system or indirectly through behaviors.
C) ​stress is more likely to result in psychological disorders than it is to result in physiological diseases.
D) ​both a and c are correct.