Final answer:
The fable 'The Fox and the Grapes' teaches the moral of accepting one's limitations after the fox fails to reach the grapes and decides they are not worth trying for.
Step-by-step explanation:
The primary moral lesson conveyed by the fox's actions regarding the grapes in the fable "The Fox and the Grapes" is B) Acceptance of one's limitations. After trying to reach the grapes without success, the fox decides they are probably sour and not worth having. This reaction is where the phrase 'sour grapes' originates, suggesting that it's typical to disparage what one cannot obtain. The moral is that people sometimes pretend to disdain what they cannot have, but the deeper lesson is about recognizing and accepting our own limitations rather than being deceived by our pride or ego.