When you see a solid center line on your side of the road, you must...

When you see a solid center line on your side of the road, it signifies that you are not allowed to change lanes or cross over into the opposing traffic lane. This regulation is in place to maintain safety on the road, especially in situations where it may be difficult to see oncoming traffic or where there are no safe opportunities to overtake another vehicle. Therefore, maintaining your position in the lane is critical for preventing accidents and ensuring that traffic flows smoothly.

Options that suggest you should brake, speed up, or turn around are inappropriate actions under these circumstances. Braking could create unnecessary stress on the vehicles behind you, speeding up to pass is not permitted since it violates the solid line's indication, and turning around would complicate traffic unnecessarily instead of maintaining safe lane discipline.