A. Whenever the baby cries, Mother sings a lullaby.
The question asks which sentence uses punctuation correctly out of the given options. The correct answer is A: "Whenever the baby cries, Mother sings a lullaby." This sentence correctly places the comma after the introductory clause, which sets the stage for the main action of the sentence. In English grammar, introductory elements like "Whenever the baby cries" set the scene for what follows and are typically followed by a comma to separate them from the main clause. The correct punctuation ensures clarity, making the sentence easier to read and understand.
Options B, C, and D misuse punctuation in various ways, leading to potential confusion or misreading. Option B incorrectly places a comma before the introductory clause when it should follow it. Option C lacks the necessary comma to separate the introductory clause from the main clause, and D places a comma in an unnatural position, interrupting the flow of the sentence.
The sentence that uses punctuation correctly is option A: 'Whenever the baby cries, Mother sings a lullaby.' This option appropriately places a comma to separate the dependent clause from the independent clause. The other options either misuse commas or fail to include necessary punctuation.
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