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Stacks are indeed erosional remnants of headlands that have been left behind as the coastal retreats. Therefore, the correct choice for the answer is true.In geology, a stack is a landform that has steep (often vertical) column(s) of rock in the sea near a coast. It's generally formed over a long time by the wind and water, and can also form when an arch is collapsed due to erosion. The stack formation usually forms in horizontally-bedded cliffs with sedimentary or volcanic rocks, particularly limestone, because these type of rocks has medium resistance to erosion.The picture below is James Bond Island, a stack located in Phang Nga Bay in Thailand.Learn more about beach erosion at https://brainly.com/question/11201021#SPJ4