Why is the amount of water that goes over Niagara Falls today only about half as much as went over the falls a century ago?

Question

Responses

Far less water enters the Niagara River from Lake Erie now than it did in the past.
Far less water enters the Niagara River from Lake Erie now than it did in the past.

Much of the water is diverted from the Niagara River to power plants that create electricity.
Much of the water is diverted from the Niagara River to power plants that create electricity.

Ice dams upriver now block a great deal of the water and prevent it from reaching the falls.
Ice dams upriver now block a great deal of the water and prevent it from reaching the falls.

The Canadian and American governments reduced the flow of water to make the falls safer.

Answer 1

The correct response is:

Much of the water is diverted from the Niagara River to power plants that create electricity.

Over the years, a significant amount of water from the Niagara River has been diverted for hydroelectric power generation, which has resulted in a reduction of the water flow over Niagara Falls compared to a century ago.