What is the source of the allusion in the sentence below?
Investors should have seen the writing on the wall.
A: a fairy tale
B: the Bible
The source of the allusion the writing on the wall is the Bible.
In the Bible, Daniel accurately translates mysterious writing that appears on a wall, and in doing so, he predicts the death of a king.
The allusion the writing on the wall means a clear indication of how something will turn out.