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Difficulty: EasySubordination and Coordination

Electric vehicles have become a common sight on highways. These cars produce zero tailpipe emissions, they still rely on electricity generated by regional power grids.

Which choice best replaces the underlined portion to make the sentence grammatically correct and logical?

  1. A
    NO CHANGE
  2. B
    While these cars produce zero tailpipe emissions; they
  3. While these cars produce zero tailpipe emissions, theyAnswer
  4. D
    Because these cars produce zero tailpipe emissions. They

Answer

The choice that begins with the subordinating conjunction 'While' and joins the clauses with a comma is correct.
The correct choice introduces the subordinating conjunction 'While' to establish a dependent clause that shows a clear relationship of contrast. This dependent clause is properly joined to the main independent clause using a comma.

Step-by-Step Solution

1
Identify the relationship between the two clauses in the sentence.
The first clause describes how electric vehicles produce zero tailpipe emissions, while the second clause points out that they still use electricity from power grids, presenting a logical contrast.
Understanding the relationship between ideas helps determine whether to use subordination or coordination, and which conjunction is appropriate.
2
Check the grammatical structure of the options to avoid fragments, run-ons, or comma splices.
Using 'While' at the beginning of the first clause makes it a dependent clause, which is correctly followed by a comma before the independent clause.
A dependent clause followed by an independent clause must be separated by a comma, not a semicolon or a period, to maintain proper sentence structure.

Key Concept

Subordination and Coordination
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Topics

Subordination and Coordination

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