What can cause a motorcycle to oscillate at high speed?

All three answers are correct. A motorcycle can start to oscillate at high speeds if the wheels are unbalanced, as this causes vibrations. Riding on uneven road surfaces can also set off oscillations, because irregularities in the road disturb the bike’s stability. Finally, carrying heavy luggage at the rear shifts the weight distribution, making the motorcycle more prone to wobbling. For safe riding, always ensure your wheels are balanced, limit heavy loads at the rear, and be especially cautious on rough roads. This will help maintain stability, especially at higher speeds.