The answer is A. Commutative Property of Multiplication

Commutative Property
is the property of a real number on which changing the order does not change the result. 
In multiplication, it is called Commutative Property of Multiplication which means changing the order of the factors does not change the product.

For examples, we have two factors, 3 and 4 multiplied together, we should get 12. Now let us make it 4 x 3, the answer is still 12. So that is the answer.