Q: You are presented with the quiz "What does recycling do to the environment?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "conserving resources has a positive impact on the environment" and "recycling conserves natural resources". So, what's the best answer to the question?

pick from the following.
[1]. prevent heat loss.
[2]. coal burning.
[3]. it has a positive impact on it.
[4]. reducing acid rain.
[5]. pollution.
[6]. greenhouse gases.
[7]. Something that makes plants green.
[8]. Enriches the soil.
A:
[3].