Hi Afzaal7,
I think the answer is B.
The ADSL2+ technology is a technology that is further extended on the basis of ADSL2 (G.992.3). The spectrum range is extended from 1.1 MHz to 2.2 MHz. Correspondingly, the maximum quantity of subcarriers is increased from 256 to 512. It supports a minimum net data rate of 25 Mbit/s in the downstream direction and 1 Mbit/s in the upstream direction.