One of the Problems of After-The-Fact or "Hindsight" Explanations Is

One of the problems of after-the-fact or "hindsight" explanations is that:

A) there are many ways of explaining past events, without overemphasizing external validity.
B) they are usually too theoretically complex and sophisticated.
C) there are many ways of explaining past events and there is usually no way to know which of these ways is correct.
D) they fail to provide a foundation on which further scientific study can occur.