What are the main types of joints in the human body?

The correct answer identifies the main categories of joints in the human body, which are classified into three primary types: synovial, fibrous, and cartilaginous joints.

Synovial joints are characterized by a fluid-filled joint cavity that allows for a wide range of motion. They include various subtypes like ball-and-socket joints (found in the hips and shoulders) and hinge joints (like the knees and elbows), illustrating the diversity of movement possible at synovial joints.

Fibrous joints, in contrast, are connected by dense connective tissue and allow little to no movement. These joints, such as sutures in the skull, play a critical role in providing stability and rigidity.

Cartilaginous joints consist of cartilage that connects bones, providing some flexibility while maintaining stability. An example would be the joints between vertebrae in the spine, which must accommodate movement while protecting the spinal cord.

The other choices do not encompass the full range of joint types present in the body. Focusing solely on specific examples of joints or other connections does not accurately represent the comprehensive classification of joints recognized in human anatomy.