During an on-field assessment of a football player who sustained a blow to the head, which of the following signs MOST urgently necessitates activation of the Emergency Action Plan and immediate transport to a hospital?
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A
Athlete reports a headache and sensitivity to light.
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B
Athlete exhibits a brief period of confusion but is now lucid.
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C
Athlete has one episode of vomiting but is otherwise stable.
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D
Athlete experiences a seizure and has a Glasgow Coma Scale (GCS) score of 13.