单选题：根据材料回答题：第三篇Hypertension Drugs Found to Cut Risk of StrokeAus

根据材料回答题：
第三篇Hypertension Drugs Found to Cut Risk of Stroke
Australian doctors declared Monday that a cocktail of simple antihypertensive drugs can lower therisk of patients suffering a repeat stroke hy more than a thir
D. This is the result of their research. Theresearch, presented at a medical conference in Italy over the weekend, has been valued highly as a ma-jor breakthrough in stroke prevention.
Strokes kill 5 million people a year, and more than 15 million suffer non-fatal strokes that oftenleave them with useless limbs, slurred speech and other serious disabilities. One in five stroke survi-vors goes on to have a second, often fatal, stroke within five years of the first.
An international six-year study of 6, 100 patients directed from Sydney University found that bytaking two blood pressure-lowering drugs, the risk of secondary strokes can be reduced by up to 40per cent. Even taking one of the commonly available drugs can cut the risk by a third, the study said.The drugs are the diuretic indapamide and the ACE inhibitor1 perindopril, better known by its brandname Coversyl. The combination was effective even in patients who did not have high blood pressure,the researchers said. They even found that the risk of another stroke could be cut by three quarters a-mong the one-in-ten patients who had suffered a cerebral hemorrhage, the worst type of stroke, wherethere is direct bleeding into the brain.
Stephen McMahon, who presented the research at the Milan congress of the European Society ofHypertension, said about 50 million people were alive who had suffered at least one stroke. "If most ofthose patients were able to get access to this treatment, it would result in3 maybe the avoidance of half a million strokes a year," the professor told Australia's ABC Radio.
McMahon said doctors had long known that lowering the blood pressure of those with hyperten-sion could help prevent strokes. "What we have shown for the first time is that it do.es not really mat-ter what your blood pressure is； if you have had a stroke, then lowering blood pressure will producelarge benefits, to begin with--even for people whose blood pressure is average or below average," hesaid.
MeMahon said the Milan gathering had heralded the research as a "major breakthrough in the careof patients with strokes—perhaps the biggest step forward that we have made in the last couple of dec-ades".
How many-peoples surviving the first stroke may suffer another attack during the following five years?
A. More than 33% of them.
B. Up to 40% of them.
C. 20% of them..
D. 10% of them.