Seeta and Geeta started walking from a Point A. Seeta walks 6 km. towards North and then takes a right turn and walks 3 km. She, then takes a right turn towards South and walks for 6 km. She again takes a left turn and walks 3 km. and reaches a point B. Geeta walks for 3 km. towards West and takes a left turn and walks for 6 km.: she takes a left turn and walks 9 km and she reaches at a point C, How far is the Point B from Point C.

• A. 9 km.
• B. 6 km.
• C. 3 km.
• D. 4 km.