I honestly don't know the answer. I'm so sorry.
Answer:What group of words from the selection conveys the author's attitude about the topic? Author's attitude is tone.
Explanation:
The main idea of this paragraph is that the rocks cannot be explained by science, that there is a mystery to them. This sentence contributes to that idea because it gives a specific example of one of the odd things about the rocks. Because they are on a flat surface they should not roll or move on their own, but the fact that they have a trail behind them shows that they have somehow moved. This supporting statement is then supported by more details about the trails.
