Answer: The correct answer is : D. sagittal suture
Explanation: The sagittal suture connects the two parietal bones of the skull, it is a type of synartrotic fibrous joint. Fibrous joints with very little or no mobility are called synartrotic, the bones are held together by fibrous connective tissues. Synarthrosis occurs where there is bone growth. Synarthrosis protects and supports ligaments and muscles.