Select the most appropriate one-word substitution for the given group of words.
A speech expressing one’s thoughts aloud to oneself

Correct option is B

The correct one-word for the given group of words is "soliloquy."
Soliloquy means a speech delivered by a character when alone, expressing thoughts aloud.
Meanings of other options:
• Harangue: A lengthy and aggressive speech.
• Hyperbole: Exaggerated statements or claims not meant to be taken literally.
• Sacrilege: Violation or misuse of what is regarded as sacred.