Direction for question: Read the passage below and solve the questions based on it. A 20 m long piece of wire is cut into two pieces, one of which is bent into a circle and the other into the square enclosing it. The ratio of the radius of the circle to the perimeter of the square is:

• A. \[8:1\]                          
• B. \[1:8\]
• C. \[4:1\]                          
• D. \[1:4\]