The first major supporting detail is in sentence 3, considering it's when the author or writer is first introducing how you can become a better writer, which is the thesis/topic of the excerpt.
B. sentence 3 is correct. It introduces us to the first tip the author provides us with on how to become a better writer.
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Answer:
SWEET HOME ALABAM
Explanation:
nice The bloodiest war was appareintly World War II
Explanation::)