Tis gone and will not answer refers to the?

Read the extract and answer the question

X : Tis gone will not answer.
Y : How now….! You tremble and look pale;
Is not this something more than fantasy?
What think you on’t?

Z : Before my God. I might not this believe
Without the sensible and true avouch
Of mine own eyes.

(Act One, Scene I, lines 52-58)

A. gravedigger
B. ghost
C. servant
D. soldier

Correct Answer:

Option B – ghost