When should a rider wear a protective helmet?

Answer: B — At all times while operating a motorcycle

Wearing a protective helmet at all times while operating a motorcycle is essential for the safety of the rider. Helmets significantly reduce the risk of head injuries in the event of an accident. Since motorcycle riders are particularly vulnerable to road hazards, falls, and collisions, consistent helmet use is crucial for minimizing injury severity. It's also important to note that motorcycle accidents can occur regardless of the time of day, traffic conditions, or the type of road being traveled. Helmet laws in many places encourage or mandate wearing helmets to ensure rider safety under all circumstances, reinforcing the notion that protective gear should be a standard practice for anyone operating a motorcycle. Consequently, wearing a helmet at all times is the best approach for ensuring the rider's protection.