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Question

Difficulty: MediumColons

In response to the growing demand for sustainable architecture, modern builders are turning to an ancient material; rammed earth, which provides natural insulation and structural durability.

Which choice most effectively punctuates the underlined portion of the sentence?

  1. A
    NO CHANGE
  2. B
    material, which is: rammed
  3. material: rammedAnswer
  4. D
    material, consisting of: rammed

Answer

The choice that reads 'material: rammed' is the correct answer.
The punctuation choice 'material: rammed' is correct because a colon must be preceded by an independent clause (a clause that can stand alone as a sentence). The clause 'In response to the growing demand for sustainable architecture, modern builders are turning to an ancient material' is independent. The colon is then correctly used to introduce the clarifying explanation that identifies the specific material (rammed earth).

Step-by-Step Solution

1
Identify the clause preceding the punctuation mark.
The preceding clause is 'In response to the growing demand for sustainable architecture, modern builders are turning to an ancient material'.
A colon or semicolon must follow an independent clause (a complete thought that can stand alone as a sentence).
2
Determine if the preceding clause is independent.
The clause is independent because it contains a subject ('builders') and a verb ('are turning') and expresses a complete thought.
This confirms that a colon or semicolon could potentially be used, provided the second part of the sentence is punctuated correctly.
3
Analyze the structure of the information following the punctuation.
The phrase 'rammed earth, which provides...' is a noun phrase explaining the ancient material, not an independent clause.
Since the second part is not a complete sentence, a semicolon cannot be used. A colon is appropriate here because it introduces an explanation or clarification of the noun 'ancient material'.
4
Verify that the colon is not preceded by a verb or preposition in the final phrasing.
The correct phrasing is 'material: rammed', which avoids placing the colon directly after a verb ('is') or a preposition ('of').
Placing a colon directly after a verb or preposition makes the preceding clause incomplete, violating standard punctuation rules.

Key Concept

Using colons to introduce lists, explanations, or clarifications after an independent clause.
Estimated Time:1m 0s
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Topics

Colons

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