What's the minimum height of an unmarked bridge? What's the minimum height of an unmarked bridge?

• Possible answers:

   
• A. 4.5 metres (14 feet 9 inches)
• B. 4.7 metres (15 feet 5 inches)
• C. 4.8 metres (15 feet 9 inches)
• D. 5 metres (16 feet 6 inches)