SAT Writing

Category - Improving Sentences

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.

Therefore the etiquette rules differs depending on where a person lives.
  1. Therefore the etiquette rules differs
  2. Therefore the etiquette rules differ
  3. Therefore, the etiquette rules differs
  4. Therefore, the etiquette rules differ
Explanation
Answer: D - The best choice is “Therefore, the etiquette rules differ”

To make the sentence easier to read or to signal a pause, a comma is used to set off the introductory adverb “therefore.” In the original sentence, the subject and verb do not agree. “Differ” agrees with the plural subject “rules.”
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