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answer: first option i.e. 'a' is correct.
since we have given that
number of minutes to wrap a small gift box = 4 minutes
we need to find the number of gifts to be wrapped in 5 minutes
since there is a direct variation, as the number of minutes will increase with number of gifts to be wrapped.
so, let the number of gifts to be wrapped in 5 minutes be x.
so, it becomes,
hence, first option 'a' is correct.