You are presented with the quiz "What impact does incineration have?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "pollutants have a negative impact on the environment" and "incineration is harmful to the environment, it pollutes". So, what's the best answer to the question?

pick from the following.
(a). heat;
(b). neutral;
(c). friction;
(d). mechanical;
(e). harmful;
(f). good;
(g). ligt;
(h). positive;
Answer:
(e).