I see you are already providing the answers. I will merely add the explanation.
Answer:
The excerpt from the Haida creation myth that is the best evidence that they valued social relationships is:
C. Still, Raven could tell the men were not truly happy. They did not have companions to join them in caring the earth.
Step-by-step explanation:
Creation myths are stories found in different cultures which explain the existence of our world and its phenomena through the interaction of characters and symbols. In the creation myth of the Haida people - indigenous people who live in North America - one of the characters is the Raven. At a certain point, the raven realizes that men are sad for not having companions. This details reveals something about the Haida culture: they value social relationships. Companionship is seen as important for happiness. According to the myth, men are only able to take care of the earth if they have someone in their lives.