And can you also show the work too

A. Five behind the line.  

Step-by-step explanation:

We can use a number line (see below) to solve this problem.

Start at 0.

Jump eight units to the right.

Then jump in succession six, four, and nine units to the left.

Finally, jump six units to the right.

You end up five units to the left of zero (five squares behind the line).

Mathematically,

0 + 8 - 6 – 4 - 9 + 6 = -5