You are presented with the quiz "To make a liquid boil more easily when heat is applied, one should" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "boiling is when liquids are heated above their boiling point" and "if the pressure is reduced, the boiling point is lowered". 

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


 

      lower the surrounding pressure     