Answer: C) Mortality.
Explanation: In literature, the theme is the underlying message of a story, it is what critical belief about life is the author trying to convey in the writing of a novel, play, short story or poem. Usually this belief, or idea, is universal and transcends cultural barriers. In the given lines from "Hamlet" by William Shakespeare, we can see the theme of mortality, by alluding to the death of very important people (like Alexander and Caesar).