Answer the following question, with explanation first. Of the below sentences, which one does *not* make sense?
Options:
- Sentence A: "Vocabulary is an important part of English learning"
- Sentence B: "Vocabulary isn't an important part of English learning"

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Vocabulary is the prerequisite for fluent writing and reading English.
So, the answer is Sentence B.