Whom does an actor address in a soliloquy? several characters the audience and one other character the audience only another character

A soliloquy is when a character speaks to him or her self, normally with the audience.

This means that we can narrow down some choices, if not all.
A.) Several Characters can be eliminated as an answer choice, as a soliloquy is when the character ONLY talks to themselves/the audience.
B.) The Audience and One Other Character can be removed, as 'other' means "not themselves".
C.) The Audience can be an answer, as the character ONLY talks to themselves and/or the audience.
D.) Another Character can be eliminated with the same reason for answer choice B.).

Your answer is:

C.) The Audience

I hope this helps!

I believe the correct answer is the third choice: the audience only.

Macbeth sees banquo as a threat