c. personification
Personification is giving non-human things human-like traits. In this line, the stars (a non-human) is being given the human-like trait of throwing. Stars also don't have spears.
An extended metaphor is when a metaphor is carried over a series of lines or stanzas. A metaphor is a comparison between two unlike things without using like or as.
A synecdoche is when the part represents the whole.
An apostrophe is a punctuation mark '. It is used in contractions and to show ownership.