Final answer:
The statement 81 + 4 = 4 + 81 exemplifies the Commutative property of addition, where two numbers can be added in any order without changing the sum.
Step-by-step explanation:
The statement 81 + 4 = 4 + 81 illustrates the Commutative property of addition. This property indicates that the order in which two numbers are added does not change the sum. In other words, swapping the addends does not affect the result. The commutative property of addition can be expressed algebraically as A + B = B + A. As seen in this example with 81 and 4, it showcases that addition is commutative, meaning that we can add numbers in any order and still obtain the same result.
Therefore, the correct answer from the choices provided is B. Commutative property of addition.