单项选择题

Once this profile is thoroughly drawn, you can begin to think about setting health priorities based on your particular portrait. For example, if you drink two martinis every evening, have a high - stress job, are overweight, smoke a pack of cigarettes a day, and use marijuana occasionally on weekends, you should quit smoking first, followed by losing the excess weight, reducing the stress of your job, giving up your marijuana habit, and then finally giving some thought to those martinis if you want to prevent first cancer, and then heart disease. Even for the youthful working person who has never been sick a day in his life, who is in excellent health, a good look at all health habits and at work and home environments may suggest changes that will benefi thim in the future.
"Setting health priorities" in the first sentence refers to

A. deciding the order of things one should do according to their impact on health.
B. deciding which habit is the most important for good health.
C. thinking about the impacts on health of different habits both at work and home.
D. thinking about the possibility of discarding the habits bad for health.
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