The first measure is as follows: quarter note B-flat below middle C, quarter note middle C, quarter note D, eighth-note triplets E-flat, D, C. The second measure is as follows: quarter note D, dotted half note F. The third measure is as follows: quarter note B-flat above middle C, quarter note F, quarter note E-flat, eighth-note triplets D, middle C, B-flat. The final measure is as follows: quarter note middle C, dotted half note F.

Question
Based on the flats in this example, what key should this be written in?
(1 point)
Responses

C major
C major

E♭major
E♭major

B♭major
B♭major

G major

B♭ major