Answer:
D) a character speaks private thoughts aloud to the audience
A soliloquy is a literary device, most often found in dramas, in which a character speaks to him or herself, relating his or her innermost thoughts and feelings as if thinking aloud. In some cases, an actor might direct a soliloquy directly to the audience, such that rather than the audience "overhearing" the character's spoken thoughts, the character is actively sharing his or her thoughts with the audience. Usually, no other characters are present when one character is giving a soliloquy. If other characters are present, the play is typically—though not always—staged to indicate that these characters cannot hear the soliloquy being spoken.
Explanation:
https://www.litcharts.com/literary-devices-and-terms/soliloquy
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