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Rhetorical Synthesis SAT question

Reading and Writing · Expression of Ideas · Medium · Answer it here, explanation included.

While researching a topic, a student has taken the following notes:

  • Planetary scientists classify asteroids based on their composition.
  • C-type asteroids are composed primarily of carbon.
  • They account for roughly 75 percent of known asteroids.
  • S-type asteroids are primarily made up of silicate minerals.
  • They account for roughly 17 percent of known asteroids.

The student wants to emphasize a difference between C-type and S-type asteroids. Which choice most effectively uses relevant information from the notes to accomplish this goal? 

ExplanationShow

Choice D is the best answer. The sentence emphasizes a difference between C-type and S-type asteroids, noting that C-type asteroids are mainly composed of carbon, while S-type asteroids are mainly composed of silicate minerals.

Choice A is incorrect. The sentence states that C-type and S-type are two types of asteroids, but it doesn’t emphasize a difference between them. Choice B is incorrect because it doesn’t directly mention C-type or S-type asteroids. Choice C is incorrect. While the sentence mentions that 17 percent of known asteroids are S-type asteroids, it doesn’t identify the percentage of asteroids that are C-type. Therefore, the sentence doesn’t emphasize a difference between the two types.

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