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Question

Difficulty: MediumCommas with Lists, Clauses, and Coordinate Adjectives

While analyzing seismic data from the subduction zone, the geophysicist tracked the frequent, subtle tremors, recorded changes in groundwater levels, and mapped the fault line's stress points.

Which choice provides the correct punctuation and structure for the underlined portion?

  1. NO CHANGEAnswer
  2. B
    frequent subtle tremors, recorded changes in groundwater levels, and she mapped
  3. C
    frequent, subtle tremors; recorded changes in groundwater levels, and mapped
  4. D
    frequent, subtle, tremors, recorded changes in groundwater levels, and mapped

Answer

NO CHANGE (the original text correctly uses a comma between coordinate adjectives and maintains parallel structure across all items in the list).
The original text correctly places a comma between the coordinate adjectives 'frequent' and 'subtle' because both words independently modify the noun 'tremors'. Additionally, it maintains a consistent, parallel list of past-tense verb phrases ('tracked...', 'recorded...', and 'mapped...').

Step-by-Step Solution

1
Determine whether 'frequent' and 'subtle' are coordinate adjectives modifying 'tremors'.
Inserting 'and' between them ('frequent and subtle tremors') and reversing their order ('subtle, frequent tremors') both make sense, confirming they are coordinate adjectives.
Coordinate adjectives require a comma between them.
2
Examine the grammatical structure of the three items in the list describing the geophysicist's actions.
The subject ('the geophysicist') performs three parallel actions: 'tracked...', 'recorded...', and 'mapped...'.
Elements in a series must maintain parallel grammatical form.
3
Evaluate the options against coordinate adjective and parallel structure rules.
The original phrasing preserves the comma between coordinate adjectives and maintains parallel past-tense verbs without extra pronouns or incorrect punctuation marks.
The original option correctly applies all conventions of punctuation and list formation.

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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