The joints between the carpal bones are:
A. gliding joints
B. hinge joints
C. saddle joints
D. pivot joints

Hint:These joints allow the bones to slide up and down, left and right and diagonally across the plane, in either direction. These joints exist between the surfaces of the two flat ligaments.

Complete answer:
The carpal bones are 8 small bones that link a hand with the wrist (or carpus). In human anatomy, the key function of the wrist is to promote efficient placement of the hand and the heavy use of the extensors and rotating arm flexors, and the freedom of movement at the wrist increases in the mobility of a single carpal bone. The carpus is the only group of bones present in the wrist between the radius and the ulna and metacarpus in tetrapods. The necessary foot part is the tarsus. The carpal bones make the wrist moving and rotating vertically.

Glide joint is a synovial joint formed among bones which meet on flat or nearly flat joint surfaces, named as a plane joint or a planar joint. Gliding joints permit the bones to slide down and up, right and left and diagonally across the plane, in either direction. Gliding joints exist in the surfaces of the two flat ligaments. Some of the bones in our wrists and ankles go against one another by gliding.
A hinge joint is a bone joint in which the joints are modelled in a way that allows only one plane to move. The body's hinge joints include the knee, hand and foot interphalangeal joints, elbow, and ankle tibiotalar.

In a saddle joint one of the joint's bones is shaped like a saddle, and the other bone is placed like a horse rider. The thumb, the shoulder and the inner ear comprise these joints.
The pivot is a free-flowing joint which allows a single axis only rotary movement. The bones of the forearm are joined to one another with the pivot joint, present near the elbow.

Thus, the correct answer is option A. i.e., gliding joints.

Note:Glide joint is a synovial joint formed among bones which meet on flat or nearly flat joint surfaces. A hinge joint is a bone joint in which the joints are modelled in a way that allows only one plane to move. A saddle joint is a synovial joint. The pivot is a free-flowing joint which allows a single axis only rotary movement.