What is emphasized by the alliteration in the lines "Hence, horrible shadow! / Unreal mockery, hence!”?

a Macbeth’s guilt about ordering the murder of his friend
b Macbeth’s fear and his desire for the ghost to vanish
c Macbeth’s willingness to stand up to any fear or foe
d Macbeth’s belief that someone created the ghost to trick him

[Macbeth.] If trembling I inhabit then, protest me
>The baby of a girl. Hence, horrible shadow!
Unreal mockery, hence!