Select the appropriate meaning of the given idiom:

"Flog a dead horse"

(A) to revive interest in the dead
(B) to be cruel towards the weak
(C) to beat up an emaciated animal
(D) to waste one's efforts on the unachievable

Choose the correct answer from the options given below:

(D) Only

The correct answer is Option (4) → (D) Only ( to waste one's efforts on the unachievable)

• The idiom "Flog a dead horse" means to keep trying to do something that is already decided, settled, or impossible to achieve.
• It refers to a pointless effort, like beating a horse that is already dead, expecting it to move.