Why Is the Conventional Explanation That the Buffalo Disappeared from the Plains

Why is the conventional explanation that the buffalo disappeared from the plains due to overhunting by whites in the West more complicated than it seems?

A) The buffalo never disappeared from the plains and simply evolved through their ability to escape detection by humans.
B) Whites actually hunted very few buffalo and focused solely on cattle drives due to better familiarity and the resources available.
C) Estimates of the buffalo population decline have since been shown to be greatly exaggerated based on improved algorithms.
D) It ignores the natural annual migration of buffalo to Mexico and Canada during the coldest and hottest months of the year.
E) Environmental factors, such as changes in climate and competition with other animals, also came into play.