What term is used for large sections of dialogue spoken by one actor?

The term "soliloquies and monologues" is indeed used to describe large sections of dialogue spoken by one actor. A soliloquy typically involves a character speaking their thoughts aloud, often when they are alone on stage, allowing the audience to gain insight into their inner feelings and conflicts. A monologue, on the other hand, is a longer speech delivered by a character to other characters or to the audience, and it can serve various purposes, such as character development, exposition, or thematic exploration.

Both soliloquies and monologues contribute significantly to the narrative by providing depth to characters and advancing the plot through their extended speeches. In contrast, the other options do not specifically refer to the context of a single actor delivering a lengthy portion of dialogue. "Dialogue Exchange" suggests a conversation between multiple characters, "Character Reflection" is more focused on internal thoughts instead of public expression, and "Plot Devices" refers to techniques or elements used to advance the story rather than specific forms of dialogue. Thus, the correct answer captures the essence of extended spoken dialogue by a single actor.