Final answer:
The accessory structures found within the dermis are hair follicles, sebaceous glands, and sweat glands, making the correct answer D) All of the above.
Step-by-step explanation:
The accessory structures found within the dermis include hair follicles, sebaceous glands, and sweat glands. These are integral components of the skin, with each playing a distinct role in its function and health. Hair follicles are the origins of hair growth, passing through the epidermis and exiting at the skin surface. Associated with each hair follicle is a sebaceous gland, which produces sebum to coat and waterproof the hair. In addition, sweat glands are also present in the dermis, playing a crucial role in thermoregulation and excretion.
Therefore, the correct answer to the question is D) All of the above, as all these accessory structures are found within the dermis.