#### Answer

E. Commutative property

#### Work Step by Step

We are given the statement $(a+b)+c=(b+a)+c$.
This is an example of the commutative property, which holds that $a+b=b+a$ (for some real numbers $a$ and $b$).
In other words, this property states that we can change the order of terms on one side of an equation without changing the answer.