Final Answer:
Synovial joints are classified into six main categories based on the A) shape of articular surfaces.
Step-by-step explanation:
Shape of Articular Surfaces: The correct classification of synovial joints is based on the shape of their articular surfaces. This classification takes into account the structure and form of the surfaces that come into contact with each other within the joint.
Explanation: This classification considers whether the joint surfaces are flat, curved, saddle-shaped, or ball-and-socket. The distinctions help in understanding the range of motion and function of each type of synovial joint.
Size, Type of Synovial Fluid, and Location: The options b) Size, c) Type of synovial fluid, and d) Location are not accurate factors for the classification of synovial joints.
Explanation: Size, type of synovial fluid, and location are important aspects of joint anatomy but are not the primary criteria for categorizing synovial joints. The primary classification is based on the shape of the articular surfaces.
In summary, the accurate statement is that synovial joints are classified into six main categories based on the shape of articular surfaces, making option a) the correct choice.