What is the primary benefit of wearing a motorcycle helmet?

Wearing a motorcycle helmet primarily provides the benefit of significantly reducing the risk of fatal head and neck injuries during accidents. Helmets are designed to absorb impact forces and protect the head in the event of a collision. Studies have consistently shown that motorcyclists wearing helmets are far less likely to suffer severe head trauma compared to those without helmets. The helmet's construction, including a hard outer shell and an inner lining that cushions the skull, effectively mitigates the injuries that can occur from falls or impacts.

This overwhelming evidence supports the notion that the primary function of a motorcycle helmet is to enhance rider safety by safeguarding one of the most vulnerable parts of the body – the head. Other benefits, such as improved visibility, reduced wind resistance, or increased comfort, may exist but are secondary to the critical life-saving aspect provided by a helmet. The emphasis on reducing fatalities and serious injuries makes option C the most compelling and correct response in this context.