The design of the helmet must be as hard as possible in order to avoid injury.
A helmet should be designed to be as hard as possible in order to reduce the force on your head during a collision because harder helmet protects the head from injury. If the helmet is harder then the head of the person is protected from injury during collision.
If the helmet is not too hard then during big incidents there is a high chance of breaking of helmet which ultimately injured the head of the person who is skating on the skateboard so we can conclude that the design of the helmet must be as hard as possible in order to avoid injury.
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Choices are the following
A helmet should be designed to be as hard as possible.
A helmet should be designed to increase the time of the collision.
A helmet should be designed to decrease the mass of your head.
A helmet should be designed to increase acceleration of your head.