Well, since Elaborate is a synonym for explain, I would guess that the student would just have to explain more about the topic.
The poem is about a series of pictures and it is describing the pictures and all the details they entail.
Answer:
In the next two lines, that seems to refer to the statement above about the second path being grassier and less worn. Now the speaker suggests that the second path was equally, not less, worn: “the passing there / Had worn them about the same.” This seems to say that the two paths had had a similar number of people walking on them, so they were fairly equally worn.
Explanation: