In the human body, platelets promote blood clotting by clumping togeth

In the human body, platelets promote blood clotting by clumping together. Aspirin has been found to prevent clotting by making platelets less sticky. Research has now shown that heart attacks and strokes caused by blood clots could be avoided by taking one aspirin a day. Statistic show that the incidence of second heart attacks has been reduced by 21% and overall mortality rates by 15% as a result of taking aspirin.

Unfortunately, the drug has several unpleasant side effects, including nausea, gastric bleeding, and, in severe cases, shock. In children, it has been linked to Reye's Syndrome, a rare, but occasionally fatal, childhood illness.

On balance, however, for men aged 40 and over, an aspirin a day may present an excellent prophylactic measure for a disease that effects 1.5 million Americans yearly and claims that lives of about 540,000 .

Which of the following conclusions can most properly be drawn from the information above?

(A) All people should take an aspirin a day to prevent heart attacks.
(B) Painkillers prevent heart attacks.
(C) Smokers can safely continue smoking, provided that they at least one aspirin a day.
(D) The majority of people suffering second subsequent cardiac arrest could have been saved by taking an aspirin a day.
(E) Aspirin can be used to reduced mortality rates in patients who have already suffered heart attacks.