3. Which key has 5 flats?

D-flat major (or the key of D -flat) is a major scale based on D ♭, consisting of the pitches D ♭, E ♭, F, G ♭, A ♭, B ♭ and C. It is enharmonically equivalent to C-sharp major. Its key signature has five flats. The D-flat major scale is:D-flat major

Explanation:

pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."