D • r = r • d

Which one is it?

Commutative Property Of Multiplication

Identity Property of Multiplication

Zero Property of Multiplication

Commutative Property of Addition

Answer: Commutative Property of Multiplication

The fourth choice is ruled out, because there is no addition. The third choice explains that if any number is multiplied by 0, then the answer is 0. The second choice explains if any number is multiplied by 1, then the answer is the original number. So, the only choice left is the first one, which is the correct answer.