Answer: C. A little girl.
Step-by-step explanation: A simile is a figure of speech that consists in a comparison between elements that aren't obviously related, to make this comparison, the author or speaker uses the words "like" or "as." In the given passage we can see an example of a simile in the line "Alas, it cried 'Give me some drink, Titinius,' As a sick girl" it compares Caesar with a sick little girl because he is crying.