What ADSL DMT line rate requires (occupies) the most bandwidth on a telephone line?

A.
8 mbps downstream, 800 kbps upstream on 1 kft (300 meters) of cable.

B.
8 mbps downstream, 800 kbps upstream on 9 kft (2.75 km) of cable.

C.
1 mbps downstream, 256 kbps upstream on 1 kft (300 meters) of cable.

D.
512 kbps downstream, 128 kbps upstream on 17 kft (5.2 km) of cable.