Plucking and abrasion are the two primary mechanisms of glacial erosion. Which of the following statements correctly describes their operation?

Options:

• A: Plucking occurs on the up-glacier (stoss) side of an obstruction due to high pressure, while abrasion occurs on the down-glacier (lee) side.
• B: Both plucking and abrasion are purely chemical weathering processes accelerated by subglacial meltwater.
• C: Plucking is dominant in areas of highly jointed bedrock on the lee side of obstructions, while abrasion is dominant on the stoss side where ice exerts high pressure.
• D: Abrasion is the shattering of rocks due to frost action, while plucking is the transport of these shattered rocks by the glacier.

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