Formal writing is that form of writing which is used for the business, legal, academic or professional purpose. On the other hand, informal writing is one which is used for personal or casual purpose. Formal writing must use a professional tone, whereas a personal and emotional tone can be found in informal writing.
I believe the answer is A. Because the definition of blank verse is verse without a rhyme scheme or pattern, which answer A does not have while the others do. Apologies if I am wrong but im fairly certain.
