What sign must be displayed near the sky rider launch?

The correct option indicates that a sign displaying "Before you launch" must be positioned near the sky rider launch area. This message is crucial as it serves to remind participants to take necessary precautions and ensure all safety measures are taken prior to their launch. It emphasizes the importance of being prepared and aware of the safety protocols before engaging in the activity.

Displaying this sign helps in reinforcing a safety-first mindset, encouraging individuals to think about their actions and surroundings before they proceed with the launch. It acts as a prompt for riders to review any instructions or safety guidelines mentioned, ensuring that they are fully ready and aware of what to expect, thereby minimizing risks associated with the ride.

The other options do not emphasize the necessary preparedness prior to launching, which is critical for ensuring rider safety and comfort. Therefore, the focus on the timing of the sign's message—instructing participants to consider safety before taking action—makes it the most appropriate choice.