Final answer:
The area of the head consisting of all the hair that falls naturally behind the ear, after drawing a line from the apex to the back of the ear, is the nape.
Step-by-step explanation:
By making a parting or drawing a line from the apex to the back of the ear, you can locate the nape of the head, which consists of all the hair that falls naturally behind the ear. The correct answer is d) Nape. The occipital bone forms the posterior base of the cranial cavity and features the external occipital protuberance and nuchal lines. The mastoid process, part of the temporal bone, can be felt on the side of the head just behind the earlobe; however, it does not reflect the region of the head with hair falling behind the ear, which is the nape. The parietal ridge is a part of the parietal bone, not specifically related to the area of hair behind the ear.