单选题 ______ we have the official list of participants, we can make the final arrangements accordingly.
A. Until B. Even though C. Now that D. Unless

【正确答案】 C

【答案解析】[解析] 连词用法辨析
既然参加者的名单有了，我们就可以做出相应的安排了。now that意为“既然，由于”，符合题意。