The answer is : the introduction
The meaning of bad according to the dictionary is of poor quality, inferior or defective. It can also mean something that must not to be desired. Synonyms would include awful, lousy, miserable, and unpleasant. The antonyms of bad are good, and favorable.
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.