The associative property of addition is a property that states that you can change how you add numbers as long as you are still adding and it is the same numbers. So if you were adding something like 5 + 4 no matter what you do to it such as switch it around to 4 + 5 or put parentheses on it like (4 + 5) it will still equal 9.
The answer to your question is B. Here's why:
-It's addition. Since we are talking about addition we can already eliminate A and C.
- The numbers stay the same. We can eliminate D.