Explanation:
Synovial fluid, found in synovial joints, contains Hyaluronic acid. Hyaluronic acid help in lubricating the joint and reducing friction, during movement
- Gomphoses are fibrous joints that connect teeth to their sockets in the maxilla (upper jaw) and mandible (lower jaw). They are classified as synarthroses, which are immovable joints.
- The joint between carpals (wrist bones) and metacarpals( hand bones) is not a pivot joint. It is actually a gliding other.
- Diarthroses are actually another name for synovial joints, which are freely movable joints, so, statements D is redundant in this context.
Therefore, the correct answer is (c) A, C.