Question

what is the source of the allusion in the sentence below?
donalds remark about your new car is clearly a case of sour grapes.
options:
a fable
british history
greek mythology

Explanation:

The phrase "sour grapes" comes from a fable (specifically from Aesop's fables, where a fox who can't reach grapes claims they are sour). British history and Greek mythology don't relate to this idiom's origin, while "a fable" matches the source of the "sour grapes" allusion.

Answer:

a fable