The correct answer is B. A speech by a character who is alone on stage and thinking aloud
Step-by-step explanation:
In drama, a soliloquy refers to a speech delivered by one of the characters of the story in which the character expresses feelings, thoughts, ideas, points of view, etc and that let the audience know the characters thoughts and perspectives told by himself or herself. The soliloquy differs from other types of speeches including monologues because they do not address to the audience or other characters but to the character itself as he/she thinks aloud usually by being alone on stage or not being heard by other characters. Considering this, a soliloquy is a speech by a character who is alone on stage and thinking aloud.