Final answer:
The internal oblique ridge is a linear prominence of bone located on the internal surface of the mandible, corresponding to the mylohyoid line.
Step-by-step explanation:
The internal oblique ridge refers to a skeletal feature inside the mouth, and its accurate identification is crucial for various medical and dental procedures. Based on the information provided, the correct option for the internal oblique ridge is 1) A linear prominence of bone located on the internal surface of the mandible. The clue comes from the description of the mylohyoid line as a bony ridge along the inner aspect of the mandibular body, which serves as an attachment for the mylohyoid muscle that forms the floor of the oral cavity.