What type of glass must windshields be made of?

Answer: C — Safety glass

Windshields must be made of safety glass because it is designed to break into small, round pieces rather than large, sharp shards. This helps to prevent injuries in the event of an accident. Tinted glass and tempered glass do not have the same safety properties as safety glass and shatterproof glass is typically only used for certain types of specialized vehicles, not for regular passenger vehicles like cars.