Final answer:
The new songs introduced in American films during the 1930s and 1940s often served to advance the plot. So, the correct option is c) They often served to advance the plot.
Step-by-step explanation:
During the 1930s and 1940s, the new songs introduced in American films played a pivotal role in advancing the plot. These songs were not merely incidental or unrelated additions but were strategically woven into the narrative, often serving as a vehicle to propel the storyline forward. Their lyrical content, melodies, and placement within the film were carefully orchestrated to enhance the emotional impact and thematic development, contributing significantly to the unfolding of the plot.
In various instances, these songs acted as storytelling tools, conveying characters' emotions, motivations, or inner conflicts. They weren't standalone pieces but were intricately integrated, allowing for a deeper exploration of the film's themes and character arcs. Moreover, these songs were crafted to resonate with the audience, aligning with the era's cultural sentiments and societal norms. As a result, they were embraced by viewers and became integral components of the overall cinematic experience, garnering appreciation and often becoming iconic in their own right.
Audiences during this period found resonance and connection with these songs, appreciating their contribution to the storytelling rather than dismissing them. Their popularity and enduring impact on popular culture underscore their successful integration and reception within the films of that era, contradicting any notion that they were poorly received.
So, the correct option is c) They often served to advance the plot.