Which of the following is a potential result of glacial plucking?

Glacial plucking refers to the process by which a glacier removes loose pieces of rock from the bedrock as it advances. This mechanism is a significant contributor to the landscape changes caused by glacial activity. One of the primary outcomes of glacial plucking is the creation of U-shaped valleys.

When glaciers pluck rocks from the valley sides and transport them, they erode the landscape in a way that results in broad, flat-bottomed valleys with steep sides, characteristic of U-shaped formations. This is different from river erosion, which typically creates V-shaped valleys. The efficiency of glaciers in plucking and eroding bedrock contributes to the distinct U-shaped profile that is seen in many glacial valleys.

In contrast, the formation of river deltas, limestone caves, and increases in soil fertility are unrelated to the process of glacial plucking. Deltas form from river sediment deposition at their mouths, limestone caves usually develop in soluble rock through chemical weathering processes, and soil fertility enhancements typically result from organic processes, not glacial movements. Each of these elements highlights how glacial processes distinctly shape landforms.