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Difficulty: MediumColons

To prevent unwanted echoes in a performance space, acoustic engineers design modern concert halls using a variety of specialized materials including: sound-absorbing panels, wooden diffusers, and heavy drapery to control sound reverberation.

Which choice best punctuates the underlined portion of the sentence?

  1. A
    materials including: sound-absorbing panels
  2. materials: sound-absorbing panelsAnswer
  3. C
    materials; sound-absorbing panels
  4. D
    materials, sound-absorbing panels

Answer

The choice that places a colon directly after 'materials' and before the list of items ('materials: sound-absorbing panels').
The correct choice containing 'materials: sound-absorbing panels' uses a colon appropriately. A colon must be preceded by an independent clause. Since 'To prevent unwanted echoes in a performance space, acoustic engineers design modern concert halls using a variety of specialized materials' can stand alone as a complete sentence, the colon is correct and properly introduces the explanatory list of materials.

Step-by-Step Solution

1
Analyze the clause preceding the punctuation mark to determine if it is independent.
The clause 'To prevent unwanted echoes in a performance space, acoustic engineers design modern concert halls using a variety of specialized materials' is independent because it contains a subject and a verb and expresses a complete thought.
In formal English, a colon must always be preceded by a complete independent clause.
2
Evaluate the relationship between the independent clause and the information that follows it.
The subsequent items ('sound-absorbing panels, wooden diffusers, and heavy drapery') form a list of examples clarifying the 'specialized materials' in the main clause.
A colon is the standard punctuation mark used to introduce a list of examples that explain or amplify a noun in the preceding independent clause.
3
Verify that other options do not introduce new punctuation errors.
Placing a colon after 'including' or using a semicolon to introduce a list are grammatical errors, and a simple comma fails to show the introductory relationship.
This confirms that only the choice with the colon after 'materials' is grammatically correct and appropriate.

Key Concept

A colon must be preceded by an independent clause and is commonly used to introduce a list, explanation, or amplification.
Estimated Time:1m 0s
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Colons

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