At 50, Keket Has a Heart Attack

At 50, Keket has a heart attack. Her physician warns her that if she doesn't take a more laid-back approach to life and her work, she will die. Because her recovery takes significantly longer than she told her employer it should, she loses her job. Rather than seeing this as an opportunity to find a job she enjoys, Keket harbours resentment and hostility toward her former coworkers and boss. Based on this information, Keket's heart attack was probably due to

A) hardiness.
B) toughness.
C) a Type A behaviour pattern.
D) a Type B behaviour pattern.