Why was it so important for a knight to take a vow of loyalty to his lord? a-the knight needed to be sure that the lord would protect him in exchange for his service as a skilled warrior. b-the knight wanted to be sure that his son would inherit his position when either the knight or the lord died. c-because the lord was a christian, it was essential for his knight to vow to become a christian as well. d-since a knight was a skilled warrior, the lord could be in great danger if the knight betrayed him.