How Did Matthews and Her Colleagues Conduct Research from Friedman

How did Matthews and her colleagues conduct research from Friedman and Rosenman's original sample on stress and heart disease?

A) They studied how each component of the Type A pattern related to coronary outcomes.
B) They studied how sustained physiological activation in response to stress can reduce the susceptibility to heart diseases.
C) They identified impatience as the only component that predicted death from heart disease at a 22-year follow-up.
D) They came up with another set of psychological characteristics that they believed can put people at risk for heart diseases.