P213 159 Biometric access-control systems---those using fingerprints, voiceprints, etc., to regulate admittance to restricted areas—work by degrees of similarity, not by identity. After all, even the same finger will rarely leave exactly identical prints. Such systems can be adjusted to minimize refusals of access to legitimate access-seekers. Such adjustments, however, increase the likelihood of admitting impostors. ---Which of the following conclusions is most strongly supported by the information above? (B) If a biometric access-control system reliable prevents impostors from being admitted, it will sometimes turn away legitimate access-seekers. (C) Biometric access-control systems are appropriate only in situations in which admittance of impostors is less of a problem than is mistaken refusal of access. 能帮我分析一下这道题吗？conclusion 和evidence各是什么？我选了C，C是不是错在only上？那请问B为何正确？我觉得原文只交代了一种相反的情况的可能性，不能由此推出B的 情况。
