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Answer»

Solution

We can eliminate D as abrupt means something which is sudden(he did not smile suddenly). Decidedly can be eliminated as we cannot USE in CONNECTION with smile. profusely means abundantly& usually means casually(although bot are GRAMMATICALLY correct, we cant use for the blank) . The previous phrase in the sentence states that he was kind in nature. HENCE Benignly follows well as it means kindly and friendly. Hence, C



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