Question

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

Explanation:

The phrase "sour grapes" comes from Aesop's fable "The Fox and the Grapes", where a fox who can't reach grapes claims they are sour. It's a fable, not Greek mythology (Greek mythology has stories like those of gods, heroes, etc., not this fable - like moral story structure here).

Answer:

a fable