Which of the following terms translates to 'with vigor and spirit'?

The term that translates to 'with vigor and spirit' is indeed "con brio." This phrase is often used in musical contexts to indicate that a piece should be played in a lively and spirited manner, conveying energy and enthusiasm. The essence of "brio" encapsulates a sense of brightness and buoyancy, encouraging performers to inject vitality into their interpretation, thereby creating an engaging and dynamic performance.

The other terms, while they have their own distinct meanings, do not convey the same sense of vigor. For instance, "con grazia" translates to 'with grace,' suggesting a more elegant or flowing approach. "Con espressione" means 'with expression,' which emphasizes emotional depth rather than vigor. Lastly, "con fuoco" translates to 'with fire,' suggesting intensity and passion, but it doesn't capture the same lively spirit and buoyancy that "con brio" does. Understanding these nuances enhances a musician's ability to interpret and deliver the intended emotion of a piece effectively.