The correct option is D hyoid
The U- shaped bone present at the base of the buccal cavity is the hyoid bone. It is situated in the upper part of the throat, above the larynx. It serves as a point of attachment for certain tongue muscles and the floor of the mouth.
The ethmoid bone is one of the cranial bones.
The inferior nasal conchae is one of the facial bones.
Incus is one of the ear ossicles along with malleus and stapes.