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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?

Planetary scientists classify asteroids into types, two of which are the C-type and the S-type.

Planetary scientists consider an asteroid’s composition (such as whether the asteroid is composed mainly of silicate minerals or carbon) when classifying it.

Roughly 17 percent of known asteroids are classified as S-type asteroids; another percentage is classified as C-type asteroids.

C-type asteroids are mainly composed of carbon, whereas S-type asteroids are primarily made up of silicate minerals.

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Explanation

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.