This text excerpt explains a study done on football players who had concussions and those who did not. The study found there was no difference in how fast or accurately the players answered questions. However,
A there was no difference in general medical costs for the players.
B the brains of players who had concussions had to work harder to complete the memory test tasks.
C the players with concussions also struggled in their classes.
D the brains of players who did not have concussions also showed greater levels of happiness.
The correct answer is B: the brains of players who had concussions had to work harder to complete the memory test tasks.
Explanation: While the study indicated there was no significant difference in the speed or accuracy of answering questions between players with concussions and those without, it suggests that the cognitive effort required by players who had concussions was greater. This implies that their brains had to exert more effort to perform at a similar level. If you have more questions or need further clarification on this topic, feel free to ask!