Sir Bedivere did not obey King Arthur's request because he was enchanted by the sword and because he desired the glory it promoted.
You didn't provide the answer options, but we can get to the answer shown above because:
Sir Bedivere became greedy when he saw the Excalibur, on account of the beauty it possessed and the glory it promoted to its bearer. For this reason, he desired to possess this sword and did not grant the king's request.
More information:
https://brainly.com/question/15876493?referrer=searchResults