Final answer:
The first movement of Vivaldi's 'Spring' is lively and energetic, starting with slow and mournful notes in a minor key and gradually becoming louder and more energetic as the melody progresses.
Step-by-step explanation:
The correct answer is B. Lively and energetic.
In the description provided, the first movement of Vivaldi's 'Spring' is characterized as lively and energetic. The music starts with slow and mournful notes in a minor key, creating a sense of melancholy. However, as the melody continues, it gradually becomes louder and more energetic, reflecting the change in mood as the heroine sees a man approaching. The dissonance of the chords adds tension and suspense to the scene, suggesting that the heroine may be in danger.