Full-thickness burns impact which of the following?

Full-thickness burns are severe injuries that penetrate through all layers of the skin, including the epidermis (the outer layer), the dermis (the underlying layer), and extend into the subcutaneous tissue and potentially deeper structures, including muscles, bones, and nerves. This type of burn results in significant tissue damage, which can lead to complications such as infection and loss of sensation due to the destruction of nerve endings.

The reason option C is the correct answer is that it accurately describes the extensive reach of full-thickness burns compared to the other options. The other scenarios mentioned, such as only affecting the epidermis, or just the skin and muscles, fail to capture the full extent and severity of full-thickness burns, which compromise all skin layers and underlying structures. This comprehensive understanding is crucial for appropriately assessing and managing full-thickness burn injuries in a first aid context.