The correct answer is B. A focus on elements of nature, such as trees and rivers.
Myths have several characteristics: good versus evil, Gods in disguise, heroes (typically children of the Gods) defeating evil monsters, origin of some aspect of the world.
They explain natural phenomena and how they came to be, and thus, they tend to focus elements of nature.
For example, in Nordic mythology it is said that earthquakes are the result of Loki's punishment for killing Baldr. Loki struggled violently due to having venom dripped on his face by a serpent, and thus shook the earth.
