A metaphor is a figure of speech that directly asserts that one element is similar or equal to another element. This figure of speech is use comparisons to describe an event, someone, a place, etc., without using the words "like" "as", "such as" like similes do. Therefore, "Antony is but a limb of Caesar" is a metaphor because the statement figuratively asserts that Antony is something else.
D. Metaphor. It's not simile (would have to have like or as), not personification because there is no inanimate object involved, and obviously not foreshadowing.
