Here is the equation:

The first thing you need to do is distribute the negative for the equation in the parentheses.

Here is your new equation:

Now you need to combine like terms. You have -8x and 5x. You can just add -8 and 5 and then add the x.

Here is your new equation:

Your answer is the 2nd choice, -3x - 4
If you have any questions, feel free to ask in the comments! :)