You are presented with the quiz "What comes from burning coal and oil dissolving in water in the atmosphere?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "gases from burning coal and oil dissolving in water in the atmosphere causes acid rain" and "an acid is defined as a compound which can donate a proton ". 

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


 

      A compound that donates proton     