What is the key signature with no sharps or flats?

• A. No sharps or flats
• B. A major
• C. G major
• D. D major

Answer: (A)

Having no sharps or flats in a key signature means every note stays natural—none are altered across the piece. This signature is used for C major (and its relative minor, A minor). The other major-key options correspond to signatures with sharps: A major has F#, C#, and G#; G major has F#; D major has F# and C#. So the description that literally states there are no sharps or flats matches the blank signature, making it the best choice. In practice, if you encounter a blank key signature, you’re in C major (or A minor) unless the context points elsewhere.