请教大侠们：
15. Bill: Smoke-detecting fire alarms can save lives. I believe that every apartment in this city should be required by law to be equipped with a smoke detector.
Joe: I disagree with your proposal. Smoke detectors are just as important for safety in private houses as they are in apartment.
From this exchange, it can be inferred that Joe has interpreted Bill’s statement to mean that
(A) the city should be responsible for providing smoke detectors for apartments
(B) residences outside the city should not be equipped with smoke detectors
(C) only apartments should be equipped with smoke detectors
(D) the risk of fire is not as great in private houses as it is in apartments（C）
(E) the rate of death by fire is unusually high in the city in question
这道题的问题没看懂，是说"可以推断出来joe认为bill 的结论是什么"吗？interprete是认为的意思吗？D为什么不对呢？是不是JOE没有提到过private houses ，所以不能选。
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