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Difficulty: MediumCommas with Lists, Clauses, and Coordinate Adjectives

When analyzing low-frequency gravitational waves from merging supermassive black holes, astrophysicists processed complex, massive data sets, identified subtle timing anomalies, and published their findings in a peer-reviewed journal.

Which choice provides the correct punctuation for the underlined portion?

  1. NO CHANGEAnswer
  2. B
    complex massive data sets, identified subtle timing anomalies and published
  3. C
    complex, massive data sets, identified subtle timing anomalies; and published
  4. D
    complex, massive data sets, they identified subtle timing anomalies, and published

Answer

The original sentence correctly separates the coordinate adjectives with a comma and uses serial commas between items in a three-part list.
The original text accurately uses a comma between the coordinate adjectives 'complex' and 'massive' because both words independently modify the noun 'data sets'. Furthermore, commas correctly separate the three parallel verb phrases in the series ('processed complex, massive data sets', 'identified subtle timing anomalies', and 'published their findings').

Step-by-Step Solution

1
Evaluate the adjectives preceding 'data sets'.
'Complex' and 'massive' are coordinate adjectives because they can be joined by 'and' ('complex and massive data sets') or reordered ('massive, complex data sets') without altering the sentence's meaning.
Coordinate adjectives require a comma separating them.
2
Identify the list structure in the sentence.
The sentence contains three parallel action predicates: 'processed...', 'identified...', and 'published...'
Items in a series of three or more must be separated by commas, including a serial comma before the final coordinating conjunction.
3
Verify clause boundaries.
All three items share the single subject 'astrophysicists', so no semicolon or subject insertion is needed.
Semicolons are reserved for separating independent clauses or items containing internal punctuation.

Key Concept

Commas with Coordinate Adjectives and Parallel Lists
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Topics

Commas with Lists, Clauses, and Coordinate Adjectives

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