Which major key has 1 sharp?

The correct answer is D Major. This key signature includes one sharp, specifically F#. In Western music, the sharp indicates that the F note in the scale is raised by a half step, contributing to the overall tonality of the major scale.

To further clarify, A Major has three sharps in its key signature (F#, C#, and G#), G Major has one sharp, but D Major is the correct answer here since its signature reflects the one sharp limit specified in the question. C Major, on the other hand, has no sharps or flats at all. Understanding how to identify key signatures is essential for developing skills in sight-reading, improvisation, and composition in the context of various musical styles.