Answer: D. Cartilaginous joints where hyaline cartilage unites the ends of bones
Synchondrosis is a type of cartilaginous joint where bones are completely joined together or united by hyaline cartilage. Synchondroses are immovable joints and are therefore described as synarthroses. Although also found in mature skeletal samples, synchondrosis is found mainly in developing. It is useful in providing early support for the skull during development.