Tony wants to model the Associative property of addition using a number sentence. Which number sentence could be used for Tonys model?

A. 6 + (4+5) = 6 + (5+4)

B. 8+7=8+7+0

C. 7 + (3+6) = (7+3) + 6

D. 8+7=9+6

16 is 4 times as large as blank

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