Answer: Option A
Answer: (a)
The Ganga-Brahmaputra basin is a high earthquake risk zone. It comes under Zone 5 covers the areas with the highest risks zone that suffers earthquakes of intensity MSK IX or greater.
Experts warn that as many as a million deaths could be expected on the Ganges and Brahmaputra plain, as the southern flank of the Himalayas has not been active enough over past centuries to release the energy accumulated by the upward movement of the Indian plate.