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Sarah ___be at home because she phoned me from the office ju

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Sarah ___be at home because she phoned me from the office just now .
A.mustn't B.isn't able to C.mighe not D.can't
,为什么?
Sarah ___be at home because she phoned me from the office ju
can't表否定推测,’不可能‘的意思.(原句意思知道吧?)
must表示肯定推测,意为’一定‘.但mustn't 则是’禁止,不允许‘的意思.
isn't able to 是不能够,意思不对.C.mighe not表示可能性很小.