Answer: d
Step-by-step explanation:
The intrinsic muscles originate and attach to other structures within the tongue.
There are four paired intrinsic muscles of the tongue and they are named by the direction in which they travel – the superior longitudinal, inferior longitudinal, transverse and vertical muscles of the tongue. These muscles affect the shape and size of the tongue – for example, in tongue rolling – and have a role in facilitating speech, eating and swallowing.