Answer:
3rd degree burn
Step-by-step explanation:
A first degree burn effects, you guessed it, the first layer of skin, the epidermis.
A second degree all the way down to the dermis, the second layer.
A third degree burn effects all layers of skin down to the tissues below.
A fourth degree burn is a subset of a third degree, but it implies that it goes all the way to the muscle or bone.