单选题 Mark tried to tie the boat to the buoy so that______. [A] he could spend the night on it while John was looking for help [B] he and John could go sailing again when the fog cleared [C] they would be safer
【正确答案】 C
【答案解析】[考点] 推理题 [解析] 从文中第2段第3句可知他们是为了安全着想。