S and R both started from and in the same direction. S turned to her left and R to his right. S walked for 5 km in the direction in which she turned and the other side R stopped for sometime and then walked for only 3 km. Then S turned to her left and R to his right Then they walked 15 km and 9 km ahead respectively. What is the minimum distance S and R?

• A. 8 km
• B. 10 km
• C. 12 km
• D. 15 km