Final answer:
The correct order to check before mounting the bike is d) Lights, brakes, helmet, gears, tires.
Step-by-step explanation:
1.Lights: Ensure that the bike's lights are functional if you're riding in low light conditions or during nighttime for safety.
2.Brakes: Check the brakes to ensure they are working correctly, as they are crucial for controlling and stopping the bike.
3.Helmet: Always wear a helmet for safety while riding a bike.
4.Gears: Verify that the gears are functioning smoothly for a comfortable and efficient ride.
5.Tires: Check the tires for proper inflation and any signs of wear or damage to prevent issues during the ride.