Final answer:
The significance of 'Spring' from The Four Seasons is that it is programmatic music designed to depict the seasons. It uses string instruments exclusively and is written in a major key.
Step-by-step explanation:
The significant aspect of Spring from The Four Seasons is that it is programmatic, depicting the seasons. This means the music is designed to evoke an idea or tell a story which, in this case, is the changing seasons. Antonio Vivaldi composed this piece using a Baroque style, which is rich in expression and elaborate ornamentation. Spring, along with the other three concerti in The Four Seasons, is notable for its depiction of nature sounds and scenes through music.
The Four Seasons is known for using only string instruments to create a dynamic range of musical expressions. The music moves through a series of melodies and rhythms that mirror the atmosphere and activities associated with each season. For example, Spring features sections that musically represent birds singing, streams flowing, and the gentle warmth of the sun.
Contrary to some of the other options provided in your question, Spring from The Four Seasons is written in a major key, which contributes to the cheerful and uplifting mood of the piece. Additionally, each concerto in The Four Seasons has three movements, not five. It is through these characteristics that Vivaldi's work has become emblematic of Baroque music and remains popular to this day.