You are presented with the quiz "Freezing and thawing cause what type of weathering?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cycles of freezing and thawing water cause ice wedging" and "ice wedging is the most important form of mechanical weathering". So, what's the best answer to the question?

Possible answers:
(A). loose soil;
(B). climate;
(C). mechanical;
(D). flooding;
(E). Sediment;
(F). rivers;
(G). Metling snow;
(H). Winter;
The answer is:
(C).