单项选择题

A.高速率下行:80Mbps上行:50Mbps;高效率下行:5bit/s/Hz,上行:3bit/s/Hz
B.高速率下行:100Mbps上行:60Mbps;高效率率下行:6bit/s/Hz,上行:2.5bit/s/Hz
C.高速率下行:80Mbps上行:50Mbps;高效率下行:6bit/s/Hz,上行:3bit/s/Hz
D.高速率下行:100Mbps上行:50Mbps;高效率下行:5bit/s/Hz,上行:2.5bit/s/Hz