The best choice for the underlined word that reflects the relationship between the ideas expressed in the paragraph is:
A. NO CHANGE
This is because the sentence is stating a general principle about the effectiveness of characters vocalizing their conflict, and it introduces soliloquy as a tool that supports that principle. The other options (B, C, D) imply a different kind of relationship (rephrasing, contrast, or specific illustration) that doesn't fit the context of the sentence.