, people are beginning to realize how serious this situation is.A. FortunateB. Fortunately

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A. Fortunate
(答案→)B. Fortunately
C. Being fortunate
D. being fortunately
解析：考查词性辨析。Fortunate（形容词）幸运的；Fortunately（副词）不幸地；句意：幸运地是，人们开始意识到情况是多么的严重。本句中的Fortunately做状语，对整个句子进行解释。故B正确。