How is a soliloquy different from simple dialogue a) in a soliloquy the main protagonist describes each of the other characters. b) in a soliloquy the characters describe each others physical traits. c) in a soliloquy a character stands alone and shares his or her thoughts. d) in a soliloquy a minor character reveals the plot of the story.

The correct answer is C) In a soliloquy a character stands alone and shares his or her thoughts.
A soliloquy means that the protagonist is talking to himself (with no one else around him but the audience) and is usually revealing some secrets we couldn't normally find out. A dialogue includes at least two people, but when it comes to a soliloquy, there is only one character there.