The main function of the tread pattern on tyre is that

• A. the tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
• B. the crests between the tread grooves absorb road noise
• C. in wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
• D. the tread pattern protects the tyre's inner carcass from small stones and pieces of glass