Respuesta :
I believe that: Sir Gawain tells King Arthur that "King Arthur will be killed if he fights Mordred the next day" A)
The correct answer is A.
After being mortally injured, Gawain writes to Lancelot, asking for his help against Mordred.
He then appears in the King's dreams, warning him to not fight and wait for Lancelot's return to Britain to attack Mordred.