Which minor key corresponds with no flats or sharps?

The key of A minor is unique among the options listed because it is the only minor key that has no flats or sharps in its key signature. In A minor, the natural notes are A, B, C, D, E, F, and G, forming a scale without any alterations. This key is considered the relative minor of C major, which also has no flats or sharps, further affirming its unique position.

The other minor keys mentioned have either flats or sharps in their key signatures: G minor has two flats, D minor has one flat, and E minor has one sharp. Understanding the relationship between natural notes and their corresponding minor keys helps in identifying key signatures effectively, particularly in the context of music theory and harmony.