Ball-and-socket joints allow flexion, extension, rotation, abduction (moving away from the midline of the body), and adduction (moving toward the midline). Which option is an example of a ball-and-socket joint?
a. the knee.
b. the elbow.
c. the hip.
d. the joints between bones of the fingers.

C. the hip

Explanation:

The ball and socket joint is the type of synovial joint present between the bones having structures like ball and socket. This joint is found in the shoulder joint. Head of the humerus acts as the ball and the glenoid cavity of scapula acts as the socket.  Both of them forming the hip.

So the correct option is C.

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explanation: