In the first one, it says the hand is to glove. What does the glove do? It can help in protecting the hand from different things. It can protect the hand when it holds on to the handlebars of the motorcycle.
Out of all the given choices, I believe that the hair is the only one that can offer some sort of protection to the head. The hair is in charge of protecting the head against the sun’s rays. It can also protect the head from some falls and collision with other hard objects although it would not be strong enough to offer protection from very hard hits.