13. The answer is: B. Responsible
As a king, he felt that the dragons possess a high level of danger for his people, and he is responsible to defend them. He then decided to pursue the dragon without any help from the people, fearing many of them would be killed by the dragon.
14. The answer is: A. Beowulf
Protagonist refers to the centre character of the story who had to overcome a certain type of challenge to obtain his/her goals. In the battle with the dragon, Beowulf is already old and can no longer fight like he used to, and he had to kill the dragon who endanger his people (Overcoming a challenge).
15. The answer is: C. The liberation of the stolen treasure
Liberating the treasure is a really important thing for Beowulf, since he know he's most likely die in the fight with the dragons. He wants leave something for his people and the communities when he dies so they can take care of themselves.