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.
It should be the letter A for yor answer
B. False, the narrator only plays a trick on the girl.
First, what is the title and author of the work to which you refer?
I think its Our.
The answer is most likely Our.