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Verbal·Expression of Ideas·Rhetorical Synthesis

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

• Carbon can exist in several distinct structural forms called allotropes.
• Graphite is a carbon allotrope.
• Graphite is composed of stacked graphene sheets.
• Each graphene sheet is composed of carbon atoms arranged in a flat honeycomb pattern.
• Carbon nanotubes are carbon allotropes.
• They are composed of one or more graphene sheets wrapped into a cylindrical shape.

The student wants to emphasize a difference between carbon nanotubes and graphite. Which choice most effectively uses relevant information from the notes to accomplish this goal?

A

Composed of sheets wrapped into a cylindrical shape, carbon nanotubes contrast with graphite, a carbon allotrope composed of graphene sheets.

B

Unlike carbon nanotubes, which are composed of sheets of carbon atoms arranged in a flat honeycomb pattern, graphite is a cylindrical carbon allotrope.

C

The graphene sheets in graphite are stacked, whereas in carbon nanotubes, they form a cylinder.

D

Graphite and carbon nanotubes are allotropes composed of stacked or wrapped graphene sheets, but carbon can exist in several distinct structural forms.