Which lines go through the rear slider grommets?

The choice that states the C, D, and brake lines go through the rear slider grommets is correct because these lines are specifically designed to manage the deployment and control of the parachute during descent. The C and D lines connect the parachute canopy to the harness and play crucial roles in maintaining the shape and stability of the canopy after deployment, especially in the rear section. Additionally, the brake lines, which are attached to the rear of the canopy and control the descent rate and steering of the parachute, also pass through the rear slider grommets.

In contrast, the A and B lines primarily attach to the front of the canopy and are involved in the initial inflation and deployment of the parachute. This design allows for a distributed load and more effective canopy performance during freefall and canopy flight. Therefore, the rear slider grommets are specifically utilized for the lines mentioned in the correct answer, ensuring that control and stability are effectively managed.