What concept refers to the narrative technique that combines multiple perspectives or voices?

The concept that refers to the narrative technique combining multiple perspectives or voices is polyphony. This term is particularly relevant in literature, especially in works that include diverse characters expressing their thoughts and experiences, thus creating a rich tapestry of voices that contribute to the overall narrative. Polyphony allows for a multifaceted exploration of themes and ideas, as different characters can present contrasting viewpoints, leading to a deeper understanding of the story's context and the complexity of human experiences.

The other choices, while relevant to narrative techniques, do not encompass the same breadth of voices. Monologue refers to an extended speech by a single character, which limits the perspective to just that individual. Dialogue is a conversation between characters, focusing on their interaction rather than presenting varied perspectives simultaneously. Soliloquy, commonly used in drama, is a speech where a character speaks their thoughts aloud, typically when they are alone, again centering on a single voice rather than a range of perspectives. Therefore, polyphony is the best term for the technique of combining multiple voices within a narrative.