Which of the processes is not an example of chemical weathering?

Which of the processes is not an example of chemical weathering?
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A. dissolution of calcite B. breaking down of feldspar to form clay C. splitting of a rock along a fracture D. rusting of a nail E. All are examples of chemical weathering *I have read the book and researched I need help finding this please. I wouldn't be asking if I didn't knew... no rude answers*
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