Well, I think, the main point that makes the difference between "Mending Wall" and “The Purple Cow” is actually demonstrated by the rhyme. Just read each poem one more time and feel that one of them is readed easily, words matched with each other like a song's lyrics so that you can smoothly go on reading whereas "Mending Wall" is made with structure of blank verse that emphasises every line and makes reader feel it deeply.
Answer:
C
Explination: The theme is the lesson that the author is trying to teach the reader.
Answer:
4. Tear down the wall and get closer to his neighbor.
Explanation:
The speaker feels that building walls is unnecessary and unnatural, and he wants to tear it down and get closer to his neighbor.