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Difficulty: MediumCommas with Lists, Clauses, and Coordinate Adjectives

To determine the authenticity of the Renaissance fresco, art conservators analyzed the vibrant, durable pigments, extracted micro-samples from the plaster, and they recorded chemical compositions using infrared spectroscopy.

Which choice best conforms to the conventions of standard written English?

  1. A
    NO CHANGE
  2. vibrant, durable pigments, extracted micro-samples from the plaster, and recordedAnswer
  3. C
    vibrant, durable pigments; extracted micro-samples from the plaster, and recorded
  4. D
    vibrant, durable, pigments, extracted micro-samples from the plaster, and recorded

Answer

vibrant, durable pigments, extracted micro-samples from the plaster, and recorded
The correct answer maintains parallel structure by using three simple past-tense verbs ('analyzed', 'extracted', and 'recorded') to describe the actions of the subject. It also correctly places a single comma between the coordinate adjectives 'vibrant' and 'durable' without improperly inserting a comma after 'durable'.

Step-by-Step Solution

1
Evaluate punctuation between the adjectives modifying 'pigments'.
The adjectives 'vibrant' and 'durable' are coordinate adjectives because they can be joined by 'and' ('vibrant and durable') and their order can be reversed ('durable, vibrant'). A comma must separate them, but no comma should separate 'durable' from 'pigments'.
Coordinate adjectives require separating punctuation between each other, but the final adjective should not be separated from the noun it modifies.
2
Analyze the list structure following the main subject 'art conservators'.
The sentence presents a series of three past-tense verb phrases: (1) 'analyzed...', (2) 'extracted...', and (3) 'recorded...'.
Parallel structure requires items in a list to share the same grammatical form.
3
Select the choice that maintains parallel verb forms and accurate punctuation.
The choice reading 'vibrant, durable pigments, extracted micro-samples from the plaster, and recorded' correctly formats both the coordinate adjectives and the parallel verb series.
This phrasing avoids introducing an unneeded pronoun or incorrect semicolon while preserving clear, parallel structure.

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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