Heat from burning fuel warms the walls of the firebox section of the furnace in

I think you forgot to give the choices along with the question. I am answering this question based on my research and knowledge. Heat from burning fuel warms the walls of the firebox section of the furnace in a hot-air heating system. I hope that this is the answer that has actually come to your desired help.

It might be the second one

They were constantly being overlooked as a people and were being controlled by people who weren't really native to their homeland.