Final answer:
The young male's memory loss is correctly termed retrograde amnesia, a form of amnesia where memories prior to the trauma are lost.
Step-by-step explanation:
The correct term to use when documenting the young male's memory loss is C. Retrograde amnesia. Retrograde amnesia is characterized by a loss of memory for events that occurred prior to the trauma. Since the young male cannot remember the events leading up to the accident, but remembers going to a birthday party, which is likely a memory from before the injury, this is indicative of retrograde amnesia.