You are presented with the quiz "What protects things from freezing in cold weather?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "athermal insulator slows the transfer of heat" and "heat transfer fluids, such as antifreeze, protect the solar collector from freezing in cold weather". 

So, what's the best answer to the question?


 

  thermal insulators         