The associative property is:
A + B + C = A + (B + C) = (A + B) + C
And a option that uses this is:
-4i + i + 4i- i = (-4i + 4i) + (i - i)
The associative property says that we can write:
A + B + C = A + (B + C) = (A + B) + C
So, we can perform the sum in any order we want to.
Then for the given case we would have:
-4i + i + 4i- i = (-4i + 4i) + (i - i)
Where we sum in the order we want to get it equal to zero.
If you want to learn more about sum properties:
https://brainly.com/question/115658
#SPJ4