What is a key characteristic of Poetic Realism in films?

Poetic Realism is characterized by its exploration of themes that often dwell on the complexities of life, particularly the inherent bitterness and disappointment faced by its characters. This movement emerged in the 1930s as a response to the struggles and realities of everyday life, often depicting the lives of the working class in a manner that highlights both their aspirations and the societal challenges they encounter.

The focus on themes of bitterness and disappointment allows filmmakers to create a poignant narrative that resonates with audiences on an emotional level. This approach encourages viewers to engage with the characters' struggles, fostering a deeper understanding of the human condition and reflecting the social issues of the time.

Other options like a focus on happy endings, exclusively comedic plotlines, and supernatural elements do not align with the core principles of Poetic Realism. Instead, the genre emphasizes a more nuanced and often somber exploration of life's realities, making the correct answer a clear representation of one of its defining characteristics.