Which statement justifies that x2 + 3x - 1 multiplied by 2x2 - 2x + 1 obeys the closure property of multiplication?
(A) The result 2x4 - 6x2 - 1 has a degree of 4.
(B) The result 2x4 - 6x2 - 1 is a trinomial.
(C) The result 2x4 + 4x3 - 7x2 + 5x - 1 has a degree of 4.
(D) The result 2x4 + 4x3 - 7x2 + 5x - 1 is a polynomial.
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