What should be avoided when carrying cargo on a motorcycle?

Answer: B — Fastening excess cargo to the sissy bar

When carrying cargo on a motorcycle, it is crucial to ensure that the load is secure and does not affect the stability and balance of the bike. Fastening excess cargo to the sissy bar is not advisable because it can cause the load to shift while riding, especially during turns or when encountering bumps in the road. This shifting can compromise the motorcycle's handling, reduce the rider's control, and increase the risk of an accident. Additionally, attaching cargo to the sissy bar may obstruct the rider’s movement and create imbalances, which can lead to unsafe riding conditions. It's important to utilize secure, designated storage options and ensure that any cargo is balanced and does not exceed the motorcycle’s weight limits. Other methods, while they might seem practical, could also struggle with similar issues of stability and safety if not done correctly.