Final answer:
Glaciers erode the landscape through plucking and abrasion, processes which reshape terrain by scraping and grinding down rocks, contributing to the formation of distinct geological features.
Option A. plucking and abrasion is correct.
Step-by-step explanation:
Glaciers erode the landscape primarily through two processes: plucking and abrasion. Plucking occurs when a glacier moves over bedrock, pulls rocks loose, and incorporates them into its ice. Abrasion happens as these rocks and other debris embedded in the glacier scrape across the underlying rock bed, effectively sanding it down. Both processes profoundly reshape the landscape, creating features such as U-shaped valleys, fjords, and glacial erratics scattered across the terrain.
Ice is an especially effective sculptor of the landscape, often more so than other erosion agents like water or wind. Glacial erosion can eliminate soil layers, deposit a variety of soil materials, and create new topographical features which shape the surrounding environment. Over time, retreating glaciers leave a lasting imprint on the earth's surface.