What Is the Effect of Brief Periods of Mental Stress

What is the effect of brief periods of mental stress, based on laboratory experiments with cardiology patients?

A) They have little, or no, impact on overall cardiac function.
B) They can intensify chronic symptoms of heart disease, such as arteriosclerosis.
C) They can trigger acute symptoms of heart disease, such as myocardial ischemia.
D) They can trigger emotional responses such as depression and feelings of despair.