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题目材料：
People who are infected with the hepatitis-C virus develop antibodies to the virus. Current tests that are used to screen donated blood for hepatitis C do so by detecting the presence of such antibodies. All blood donations are screened, and any donation that tests positive for the presence of such antibodies is discarded. Nonetheless, there still remains a small risk of hepatitis C being transmitted by blood donations, since __________.
Which of the following most logically completes the argument?
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A.the number of people infected with the hepatitis-C virus has risen significantly in the past several years
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B.the antibody detected by the screening process is sometimes produced even when the hepatitis-C virus is not present
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C.people can be infected with the hepatitis-C virus for several years without knowing that they have the disease
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D.it often takes over two months for someone infected with the hepatitis-C virus to develop antibodies to it
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E.only a small percentage of blood donations contain antibodies to the hepatitis-C virus
D显示答案
