The answer is 'by not fulfilling expectations'. The other options don't really surprise the reader, and if the plot is going into one direction, and then what you'd expect to happen doesn't actually happen, you are surprised, and the element of irony is achieved.
Explanation:
An unfortunately worded phrase.
A way to get tossed down the stairs.
Yes it is a dramatic monologue
Fusion of two germs nuclei
