The mask wearer thus becomes a sort of medium that allows for a dialogue between the community and the spirits (usually those of the dead or nature-related spirits). Masked dances are a part of most traditional African ceremonies related to weddings, funerals, initiation rites, and so on
I think it is C. However, it should just be rock and water/ice.
I just did this lesson, and the answer is B.
I hope this helps you!
-Mikayla