Which patient has an isolated brain injury that should be considered the most serious?

A) A 31-year-old male who fell from a roof and who is now nonverbal and extends his arms and legs when you pinch the muscles on his shoulder
B) A 62-year-old female who fell and hit her head and who is becoming more confused and combative
C) A 53-year-old female who crashed her bicycle and who has a large laceration that is bleeding heavily on the back of her head
D) A 21-year-old male wearing a deformed motorcycle helmet who does not respond to verbal or painful stimuli after crashing

D) A 21-year-old male wearing a deformed motorcycle helmet who does not respond to verbal or painful stimuli after crashing