Choose the correct meaning of Idiom "Flog a dead horse".

Correct option is D

Option (d) is the correct meaning of the given idiom.
Given Idiom (Flog/Beat a dead horse): It means to waste time and effort on something that has no chance of success or has already been decided; to keep pursuing a lost cause. (Hindi: व्यर्थ प्रयास करना; निबटे हुए/निरर्थक मुद्दे को बार-बार उछालना).
Example: “Arguing about that rule now is flogging a dead horse—the decision is final.”
Other related idioms and their meanings:
· Cry over spilt milk: regret something that cannot be changed (Hindi: बीती बात पर पछताना)
· Barking up the wrong tree: pursuing a mistaken line of thought (Hindi: ग़लत दिशा में प्रयास करना)
· Spin one’s wheels: expend effort with no progress (Hindi: मेहनत करना पर प्रगति न होना)