Correct Answer: (a) Checking water flowing into Bangladesh
Note: Farakka Barrage was constructed across the Ganges River in the state of West Bengal. Its main purpose was to supply water to clear the silt at the port of Kolkata. Apart from this, deposited it was also to facilitate navigation of ships along the Ganges River and to prevent erosion of Kolkata Port, while not intended to stop the water flow to Bangladesh.