The Commutative Property of Addition states that changing the order of the addends does not change their sum. This means that for any numbers \( a \) and \( b \), \( a + b = b + a \).
Given this explanation, the correct response that demonstrates the Commutative Property of Addition is:
A) \( 5z^9 + 8a = 8a + 5z^9 \)
This option shows that the sum remains the same regardless of the order of the addends.