Explanation:
you did not give us the options.
so, I can give you the most likely equivalent expressions :
|-5|+|3| = 8
and therefore it is the same as
|5|+|3|
5+3
|-5|+|-3|
|5|+|-3|
...
I hope, one of these is also one of your answer options.
but you understand now, right ?
you need to pick the one, that is also equal to 8.
the absolute value does nothing else but converting is content into its positive value (no matter if it is already positive or if it is negative).
e.g.
|-5| = |5| = 5