Which protective gear reduces the risk of head injuries during a crash?

Answer: D — Helmet

Protecting the head during a crash comes from wearing a helmet. A helmet has a hard outer shell plus an energy-absorbing liner that crushes on impact, spreading the force and reducing the risk of skull fractures, brain injury, or concussion. It also helps keep debris from reaching your head. Sunglasses mainly shield your eyes from sun and debris, not the head. Gloves protect your hands, and boots protect your feet and ankles. So the helmet is the gear that directly reduces head injury risk.