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Choose the sentence that uses commas correctly.
A. The student gathered pens, pencils books and paper to place in the backpack.
B. The student gathered pens, pencils, books, and, paper to place in the backpack.
C. The student gathered pens pencils books, and paper to place in the backpack.
D. The student gathered pens, pencils, books, and paper to place in the backpack.
What is D. The student gathered pens, pencils, books, and paper to place in the backpack. ?