What is the primary purpose of a film's score?

The primary purpose of a film's score is to enhance the emotional experience and support the narrative through music. A film score is crafted specifically to complement the visual storytelling and evoke emotions in the audience. It reinforces the mood of scenes, heightens tension during dramatic moments, and can sometimes foreshadow events.

This use of music to convey emotion is integral to the cinematic experience; for instance, a triumphant score may align with a character's victory, while a somber melody can amplify the impact of a tragic scene. The score interacts with the visuals in such a way that it influences how viewers feel about the characters and the story unfolding on screen.

In contrast, while dialogue is essential for character development and plot progression, it does not fall under the domain of scoring. Background noise may exist, but it lacks the intentional emotional connection that a score offers. Songs may be included in a film for promotional reasons, but they do not serve the central function of a score which is to deepen and enhance the audience's engagement with the film's narrative. Thus, the role of the film score is pivotal in bridging music and storytelling, making option B the most accurate answer.