This item tests the fixed idiomatic expression "cry over spilt milk", which means to waste time being upset about something that has already happened and cannot be changed.
- Option A (To): "Cry to" would mean crying while addressing or appealing to someone, which is not the idiom being tested here.
- Option B (Over): "Over" is the fixed preposition in this idiom. "Cry over spilt milk" is the standard idiomatic phrase, so this is correct.
- Option C (About): "About" can be used generally with "cry" (cry about something), but it is not the accepted wording of this particular idiom.
- Option D (Upon): "Upon" is not used with "cry" in this fixed expression.
The correct answer is B) Over, so option 2 is the answer.