Final answer:
The mandible, which connects to the skull via the temporomandibular joint (TMJ), is the dental arch capable of movement, allowing actions such as opening and closing the mouth.
Step-by-step explanation:
The dental arch that is capable of movement through the action of the temporomandibular joint (TMJ) is the B) Mandible. The TMJ allows the mandible to perform various movements including opening (mandibular depression), closing (mandibular elevation), and side-to-side movements of the lower jaw. Unlike the mandible, the maxilla is a fixed bone of the skull and does not move. The incisors and premolars are types of teeth fixed in either the maxilla or mandible and are not related to the movement of the jawbone itself.