Final answer:
Section C of the second movement in Eine kleine Nachtmusik is in the Key of G Minor and has an Energetic mood, which can significantly influence the emotional response of the audience.
Step-by-step explanation:
The key and mood of section C of the second movement in Eine kleine Nachtmusik are Key: G Minor, Mood: Energetic. This particular movement is well-known for its dynamic and somewhat tense character which, like in a film scene, can influence the audience's emotional response.
Just as a movie soundtrack in a minor key with dissonant chords can create a sense of danger, the energetic mood of this movement in G Minor propels the music forward with vigor and a hint of restlessness. The mood of the music can make a significant impact on how a scene is perceived, whether it suggests impending danger or a joyous occasion.