The scale that has 3 flat notes on it is E flat major.
Which key has the signature of three flats?
The signature of 3 flats (3 little b's on the pentagram) corresponds to the scale that have 3 flats on it.
We will only care for major and minor ones (ignoring the other 5 modes).
If we go to Eb major, (remember that the intervals of the major scale are 2, 2, 1, 2, 2, 2, 1).
Eb, F, G, Ab, Bb, C, D
Which is also G minor, you can see that we have 3 flat notes.
So the correct option is the first one, E flat major or Eb major.
If you want to learn more about scales.
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