Answer:
B. Highlighting many key points
Explanation:
In my opinion this makes sense as the best answer since you can easily skim through any text, but to recognize key points requires that you understand the material.
<u><em>"The path was rugged and sore"</em></u>
This line is most distinctly descriptive. The other lines do contain imagery, but they require the reader to develop the image, whereas rugged & sore are very descriptive of the path's physical condition.
It reveals that Gandhi learns the importance of nonviolence.