Choose the sentence that correctly structures a balanced compound-complex sentence:
Answer and explanation
Correct answer: C. Because tools were calibrated, readings gained precision, and the team verified them.
- Step 1: A compound-complex sentence contains at least two independent clauses and at least one dependent clause.
- Step 2: Here, the dependent clause is 'Because the laboratory equipment was recalibrated', followed by a comma.
- Step 3: The two independent clauses are 'the measurements achieved unprecedented precision' and 'the research team verified the results', joined by the coordinating conjunction ', and'.
- Step 4: Option 1 punctuates and balances all three clauses flawlessly.
Answer
Because the laboratory equipment was recalibrated, the measurements achieved unprecedented precision, and the research team verified the results.
Why not the others: Sentence 2 lacks all required commas, creating run-on ambiguities; Sentence 3 reverses logical causation and ends in an unparallel participle; Sentence 4 creates a comma splice between the two independent clauses.
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