The correct choice is (b) Arthroscopy
The best explanation: Arthroscopy is a process where the bones are visualized and worked upon with the help of an endoscope. The soft parts of the knee like the cartilage or the synovial capsule cannot be properly visualized with an X-Ray so an arthroscope is used to look at them. The healing of the bones after a surgery can be monitored by the arthrocope. Small operations regarding the bones can be performed with the help of the arthroscope.