How will niagara falls most likely change naturally in the future?

Before you cancel your honeymoon suite with the heart-shaped tub, keep in mind that in the past 12,000 years the falls have moved about seven miles upstream and, at this rate, they will disappear into Lake Erie in just under 23,000 years.

Explanation:

Erosion in the Niagara Region. ... Niagara Falls has eroded 11.4 kilometers (7.1 miles) during the last 12,000 years. The slowing of the erosion rate is caused by two major factors: The limestone cap rock, which the water is currently flowing over, is more resistant to erosion. As they erode, the falls are moving upstream, so they will one day disappear into Lake Erie. Like all waterfalls, Niagara erodes because water wears away the softer rock at the base of the cliff, where a turbulent pool forms below the waterfall.

b is the right answer for this question.