The key for all of them I believe is C major.
B. The semitones would be the E to the F# to the G. The next one would be the B to the C# to the D.
C. Doesn’t have any semitones.
D. The semitones is the C to Bb to the A.
E. The semitones is E to F# to G.
F. The semitones is D to the C# to the B.
G. The semitones is A to the Bb to the C
Hope this helped.
