Final answer:
The correct option is a. In 'Morte d'Arthur', King Arthur must wait for a messenger before starting the battle with Mordred. The tale underscores the significance of patience.
Step-by-step explanation:
In the tale of Morte d'Arthur, King Arthur is supposed to wait for a messenger before commencing the battle against Mordred. If Arthur begins the battle before the arrival of the messenger, it is understood as a sign of betrayal. The story highlights the importance of patience and the consequences of hasty actions in moments of tension. In Morte d'Arthur, King Arthur is supposed to wait for a) his trusted knight before starting a battle with Mordred.
Before the battle, King Arthur asks Sir Bedivere, one of his trusted knights, to throw his sword Excalibur into the lake. Sir Bedivere hesitates and doesn't want to part with the sword, but eventually follows the command of the King and throws it into the lake.