What key signature is this Tab in?

music theory
1

I have no idea if its D major or B minor because of how it sounds and all the accidentals in it.

Also, should the C major chord be borrowed from Locrian or Phrygian?

2

With non diatonic harmony like this, the first chord is usually percieved as the tonic. Additionally bII has dominant function, which further solidifies the key of B minor. The only advantage of D major would be that there are no supermodal chords in this progression if you put it in that key.

I think it’s usually best to borrow a chord from the closest parallel mode if it’s not available from the parallel major or minor, so I would usually borrow a bII from phrygian. However in this case the F natural in the melody actually justifies borrowing the C major from locrian.

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