Question

choose the sentence that helps you visualize what can happen when an athlete is hit. nearly 1 in every 5 u.s. adolescents, for instance, has sustained a concussion. this is a particularly nasty type of head injury. what is a concussion? concussion occurs when the brain slams against the inside of the skull. among those most likely to incur a concussion are those who play football and hockey. those taking part in the winter olympic sports of snowboarding, skiing and bobsled also are at risk.

Explanation:

To visualize what happens when an athlete is hit, we need a sentence that describes the event. The sentence "Concussion occurs when the brain slams against the inside of the skull" explains the physical event (brain hitting skull) that can result from an athlete being hit, helping with visualization. Other sentences provide statistics or list at - risk sports, not the event itself.

Answer:

Concussion occurs when the brain slams against the inside of the skull.