What must a reader consider to understand an author’s purpose for writing?

Wich statements best identifies a problem with this method

Read the excerpt from "the blackfeet creation." how do readers know that this excerpt is from a myth? the excerpt describes an animal called a muskrat. the excerpt describes old man drying the mud. the excerpt describes old man scattering mud over water. the excerpt describes how muskrat create land.

What theme of antigone do the above events reflects