The correct options are
A Indus river in the west to the Brahmaputra in the East.
D Himalayas in the north to the Narmada river in the south
Under Balban the territory of the Sultanate extended from the Indus river in the west to the Brahmaputra in the East. And from the Himalayas in the north to the Narmada river in the south. To fend off Mongol invasions, he had forts built in the North-West. His army was well trained, and his arms and weapons were top of the line. Balban was the last strong Mamluk Sultan.