What is the highest note in the range of a Violin?

The highest note in the range of a violin is indeed A7. Violins are typically tuned to G3, D4, A4, and E5, and their range extends well beyond these open strings. The highest pitches can be produced through harmonics and advanced techniques employed by virtuoso players. A7, which is situated in a very high register, is within the capabilities of advanced violinists, particularly in contemporary music and virtuoso passages that explore the instrument's upper limits.

The other options, such as C6, G5, and E6, fall within the second or third octave, but none reach the extreme heights of A7. C6 is a common note that might be played, as is E6; however, they do not match the instrument's full potential for higher notes. G5 is also comfortably within the instrument's range but lacks the extreme upper register characteristic of A7. Thus, A7 correctly represents the highest end of a violin's range.