How can you find the sum [8 +(−4)] + (−8 + 4) using mental math?

For the first brackets, You can subtract 4 from 8 and that makes 4. For the second bracket, you can add -8 and 4 which gets you 4. You have simplified what is inside the brackets, now you can add them together. 4 and 4 equals 8. So the answer is 8. You can figure it out other ways also

I'm pretty sure it's b). i try drawing the functions out and b is the one that stands out or isnt a "line"