I think it’s both, but probably leaning more towards ethos.
Answer: A.
singular; idiosyncrasy
Explanation: It is not B. because it is not an innumerable talent and there is not a surplus of this talent. It is not C. because it is not insular or an idiom. It is not D. because people are not disconcerted or shocked to the point where they do not know how to act and this talent is not plural. This leaves you with A. singular;idiosyncrasy because it is a talent that not many people have and it is an unusual thing about him.
Hope this helps! :)
Answer:
By using Modernist themes instead of doubt and mystery ideas.
Explanation:
Robert Frost's poetry represent a "transition" toward Modernist literature due to movement from doubt and mystery ideas to Modernist themes which means he uses Modernist themes instead of doubt and mystery ideas. Robert Frost's poetry moved away from ideas of doubt and mystery into Modernist themes. If the structure is not Modernist so it follow traditional themes wholeheartedly so we can conclude that in Robert Frost's poetry transition occurs.