I think it's B tell me if I'm wrong. I might be wrong so if I were you I would wait for other people to answer to.
<span>none of the above.
The outline helps you plan out your esay.</span>
I believe the answer you are looking for is broadleaf forests
It is not a thesis statement because it does not show your opinion on the research you would be conducting. In a research paper you would either try to confirm that they are not an indicator, or that they are an indicator. You wouldn't write a question such as this.