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Synovial joints are characterized by their ability to allow a wide range of movements due to their unique structure, which includes a joint cavity filled with synovial fluid that lubricates the joint. The correct answer lists movements that are commonly associated with these joints.

Flexion and extension refer to the bending and straightening of a joint, which are fundamental movements in joints such as the elbow or knee. Adduction and abduction involve movements toward and away from the midline of the body, respectively, such as in the shoulder or hip. Circumduction is a more complex movement that combines flexion, extension, adduction, and abduction, resulting in a circular motion.

The other options mention movements that either are not typical of synovial joints or do not encompass the full spectrum of movements that these joints provide. For example, rotation is a component of some movements in synovial joints, but it is not the sole characteristic, and terms like compression and expansion do not specifically describe the primary movements permitted by synovial joints. Thus, the first choice accurately captures the full range of motion that synovial joints can achieve, making it the best answer.