An adverbial phrase of contrast modifies the main clause and introduces a contrasting idea. 'Despite the rising costs' is a correct and common adverbial phrase used to express contrast. Option B uses a conjunction of result. Option C uses a conjunctive adverb. Option D is grammatically incorrect ('in spite of the costs are rising' should be 'in spite of the rising costs' or 'in spite of the fact that the costs are rising').
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