What considerations are taken into account in choosing a motorcycle helmet?

1. A The helmet strength is of no significance. The most important is that it fits the size and shape of the rider’s head.
2. B The helmet doesn’t have to be standard, but it should have an aerodynamic design, to reduce fuel consumption.
3. C The helmet should have a good ventilation system and as many fastening straps as possible.
4. D The helmet should be standard, provide full protection (also to the chin) and fit the size and shape of the rider’s head.