To find the value of the expression \( | -5 | + | 3 | \), we first need to calculate the absolute values.
- \( | -5 | = 5 \)
- \( | 3 | = 3 \)
Now we can add these absolute values together:
\[ | -5 | + | 3 | = 5 + 3 = 8 \]
Therefore, the expression \( | -5 | + | 3 | \) is equal to \( 8 \).
So the correct answer is \( \boxed{8} \).