Why Might Type a Personalities Have an Increased Risk of Heart

Why might Type A personalities have an increased risk of heart attacks?

A) Hostile people have elevated white blood cell counts, which can lead to inflammation of bodily tissue.
B) Hostile people have elevated red blood cell counts, which lead people to exert more energy than they need to.
C) Hostile people tend to be lower in conscientiousness, and so eat poorly and drink too much.
D) Hostile people become ensnared in just-world syndrome, where they get what they deserve.