Which myth about horses does the way to rainy mountain relate?

a. a boy draws a picture of a horse on the side of a rock, and the horse springs to life.

b. a fearless horse dies of shame because its rider is too scared to attack an enemy.

c. the first horse comes into existence when a dog begins eating tall grass and grows bigger and stronger.

d. horses are introduced to the great plains of the united states by traveling through a hollow log.