The correct answer is B) he was afraid that Sir Tristram would steal La Belle Isoude away from King Mark on the journey.
In King Arthur's Knights, King Anguish send La Belle Isoude and Sir Tristram off with a heavy heart because he was afraid that Sir Tristram would steal La Belle Isoude away from King Mark on the journey.
We are referring to a part in the story of "King Arthur's Knights," written by Howard Pyle in 1903. The story reveals many of the possible chapters in the life of King Arthur and his men, the Knights of the Round Table. The author wrote other books that followed this one such as "The Story of the Champions of the Round Table" and "The Story of Sir Launcelot and his companions."