Which style employs expanded harmonic vocabulary while suggesting imaging rather than depicting?

The correct choice is Impressionism, which is characterized by a shift in musical language that includes an expanded harmonic vocabulary. This style focuses on evoking moods and impressions rather than conveying a clear narrative or detailed representation.

Impressionist composers often use non-traditional scales, complex chords, and rich harmonic textures to create atmospheric sounds that mimic the fluidity and subtleties found in nature. The music is designed to suggest images or feelings, allowing listeners to engage their imagination rather than presenting a clear storyline or image. This aligns with the overall artistic movement that sought to capture fleeting moments and the ephemeral quality of light and color in visual arts.

In contrast, the Romantic style, while also expressive, is more focused on deep emotional expression and often adheres to clearer melodic and harmonic structures. Modernism, although innovative and exploring new techniques, generally emphasizes abstract concepts and a break from tradition, which does not specifically align with the idea of suggesting images rather than depicting. Baroque music is known for its complexity and formality, focusing more on structured compositions rather than the suggestive, evocative nature found in Impressionism.