Q: You are presented with the quiz "cycles of freezing and thawing water can cause what?" 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 "an ordinary ice road is therefore severely damaged by cracks induced by the traffic". So, what's the best answer to the question?

Possible answers:
(a). clean county roads;
(b). exposure to cold;
(c). severely damaged roads;
(d). Physical weathering;
(e). colder weather;
(f). Metling snow;
(g). smooth safe roads;
(h). rough riding;
A:
(c).