I am about what I say because careless remarks are likely to hurt others' feelingsA. ent

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A. enthusiastic
B. concerned
C. doubtful
(答案→)D. cautious
解析：形容词短语辨析。Be enthusiastic about对…热情；Be concerned about关注…；Be doubtful about怀疑…；Be cautious about对…很谨慎；对于所说的话我很谨慎，因为粗心的评论很可能伤害到其他人的感情。根据句意说明D正确。