Our school is having a sports meeting. Someone _____ here already. [ ]

A. arrived

B. have arrived

C. has arrived

某超市在居民区建设一连锁店的机电安装工程，业主通过招标，由具有机电安装工程总承包一级资质的A单位承接，其中空调所用制冷燃气溴化锂机组分包给具备专业施工资质和压力管道安装许可证的B单位负责供货和安装。

请根据背景资料完成以下单选题：

应由B施工单位编制包括制冷机房安装在内的施工组织设计。