The correct option is B synovial joint
A pivot joint is a type of synovial joint. The synovial cavity/joint is filled with synovial fluid. They are the most common and most movable type of joint in the body. As with most other joints, synovial joints achieve movement at the point of contact of the articulating bones.
Cartilaginous joints allow more movement between bones than a fibrous joint but less than the highly mobile synovial joint.