Write the next sentence in the following story.

How to sit up straight at a computer
Face forward.
Keep your torso and neck in line. Ensure your back is adequately supported, with a slight curvature in your lower back.

OPTIONS: I. Follow this curve with your elbows and knees toward your feet. Do not lean forward to center your weight on this curve.; II. Stretch that side out a bit more, making sure to keep your back straight. For better posture you can lay down on top of a desk.; III. Keep your head level and your eyes looking ahead of you. Do not tilt your head to one side or the other.; IV. ( grab even if you start to feel hurt/sensation like your back might rip. ) Keeping your spine straight with your lower back slightly arched.;. The answer should be
III.