Explanation
The correct option to complete the sentence is:
D) over
Explanation: The complete phrase is "Don't cry over spilt milk." This idiomatic expression means that one should not dwell on past mistakes or regrets. It suggests that there is no use in being upset or lamenting over something that has already happened and cannot be changed, much like crying over milk that has been spilled. The preposition "over" is used in this context to indicate the object or situation that one is excessively upset about. Options B) about, C) for, and A) on do not fit the phrase and do not convey the intended meaning.
