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Burglar alamrs______at any time of the day or night serve on

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Burglar alamrs______at any time of the day or night serve only to annoy.
A.that go off B.that are going off C.go off D.which going off
答案为什么是A
at any time of the day or night 表示经常发生的事只能用现在时.that go off at any time of the day or night 修饰主语burglar alamrs,that go off at any time of the day or night 是定语从句,选c会导致谓语混淆,到底是go还是serve