Final answer:
In physics, the concept of 'fire' is not related to parts of the human body, such as the head or feet. Therefore, the options provided in the question are not relevant.
Step-by-step explanation:
In physics, the concept of 'fire' is not related to parts of the human body, such as the head or feet. Therefore, the options provided in the question (A. Heel, B. Black, C. Origin, D. Green) are not relevant to the concept of fire. The question seems to be a misinterpretation or mix-up of information.