Choices:
(1). the plastic;
(2). consumers;
(3). the thoughts;
(4). exercise;
(5). critical organs;
(6). lowered energy cost;
(7). the bags;
(8). the environment;
Q: You are presented with the quiz "Reusing plastic bags has a positive impact on what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "recycling has a positive impact on the environment" and "plastic bags are recyclable and they are reusable". So, what's the best answer to the question?
A:
(8).