Based on the play "Hamlet" that was written by William Shakespeare, the sequence of events that triggered by killing of Polonius is this:
1. Hamlet was sent away.
2. Laertes returns in revenge for the death of his father.
3. Hamlet's ship was attacked by pirates.
4. The suicide of Ophelia.
Hope this helps.
The correct answer is C. Setting.
The theme is the underlying idea of the story, the plot is how the events happen, while the language used is self explanatory.