My sister thought I would say sorry to her .But to _____ surprise,I went into my room without anywords A her B my C she

My sister thought I would say sorry to her .But to _____ surprise,I went into my room without any
words A her B my C she

答案选A her 她的（物主代词） my 我的 she她（主格形式）,根据句子意思应该选她的..
句子意思：我妹妹认为我应该向她道歉,但让她吃惊的是,我一句话也没说就进了我的房间.
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