Which element in drama provides insight to characters' motives and emotions?

The correct choice is soliloquies because they are a specific form of speech in drama where a character speaks their thoughts and feelings aloud, often when they are alone on stage. This format allows the audience to gain direct insight into the character's inner workings, including their motives, desires, and emotional state. Since soliloquies reveal the character’s private thoughts, they cultivate a deeper understanding of the character’s motivations and the conflicts they may be facing.

Dialogue, while important in revealing relationships and advancing the plot, often involves back-and-forth exchanges between characters and might not solely reflect a character's inner thoughts. Action can also hint at motives and emotions, but it primarily conveys what characters do rather than their internal reasoning. Monologues may express a character's feelings in a longer speech but can also be directed toward other characters or the audience, which might not capture the authenticity of inner reflections as effectively as soliloquies do.