单选题 ______ beef consumption has been on the decline, a task force has been created to identify reasons.
【正确答案】 C
【答案解析】[解析] 词汇：连词
1．这是一道词汇题，选项均为连词。
2．主句和从句的关系是原因与结果的关系，连词because表示原因。因此C为正确选项。