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In the following example of "Simplifying an Expression", what reason would be used for step A? Simplify the expression 3k + 7 + 2k and justify each step 3k + 7 + 2k = 3k + 2k + 7 A = open parentheses 3k + 2k close parentheses + 7 B = open parentheses 3 + 2 close parentheses times k + 7 C = 5k + 7 D A. Addition B. Commutative Property C. Associative Property D. Distributive Property