Direction: David and Dravid started from a place denoted by 0, in opposite directions. After Dravid walked for 8 m, he met Sajid. After 7 m from the starting point David met Sahid. Dravid went back 2 m to buy a book. David went ahead 3 m to the library. What is the distance between Sajid and Sahid?

• A. 1m                        
• B. 8 m
• C. 7 m                       
• D. 15 m