Which expression shows that 11 + 7 = 5 + 13?
a.
(5 + 6) + 7 = 5 + (6 + 7)
b.
6 + 6 + 6 = 18
c.
5 + 9 + 4 = 6 + 7 + 5
d.
(11 + 4) + 3 = (5 + 7) + 6

The best and most correct answer among the choices provided by your question is first choice or letter A. 
The expression (5 + 6) + 7 = 5 + (6 + 7) would still be equal to 11 + 7 = 5 + 13 because it makes use of the Associative Property.

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A. (5+6)+7 = 5+(6+7) because
11+7=5+13 
11+7=18 - 5+13=18
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