Final answer:
A fourth-degree burn is when all three skin layers and the underlying tissues, including muscle and bone, are destroyed, leading to a lack of pain due to damaged nerve endings. The recovery process for such burns involves complex medical procedures.
Step-by-step explanation:
Degree of Burn where Victim Feels No Pain
The degree of burn in which all three layers of skin have been destroyed and the victim feels no pain is a fourth-degree burn. This type of burn is the most severe and involves damage not just to the full thickness of the skin but also affects the underlying muscle and bone. In cases of third-degree burns and fourth-degree burns, the nerve endings are damaged to the point that the victim might not feel pain in the burn area. The recovery from fourth-degree burns is complex and requires medical interventions like excision, possibly amputation, and grafting of the skin.
To answer the presented multiple-choice question, the correct option is D. Fourth.