Question

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Explanation:

Analyze the sentence structure

The sentence consists of an independent clause ("Marcus realized he had forgotten the last page") and an introductory dependent clause ("After he turned in his homework").

Apply punctuation rules for introductory clauses

When a complex sentence begins with a dependent adverbial clause, a comma must be placed immediately after the dependent clause to separate it from the independent clause.

Evaluate the given options

• Option 1: Missing a comma after the introductory clause "homework".
• Option 2: Incorrect comma placement and structure.
• Option 3: Correctly places a comma after the introductory clause "After he turned in his homework".
• Option 4: Incorrect comma placement.

Answer:

• (A) "After he turned in his homework Marcus realized he had forgotten the last page."
• (B) "Marcus after he turned in his homework, realized he had forgotten the last page."
• (C) "After he turned in his homework, Marcus realized he had forgotten the last page." (Correct answer)
• (D) "Marcus, after he turned in his homework realized he had forgotten the last page."