D.
C
The subdominant in a scale is the 4th, which in the key of B-flat major is E-flat.
E flat.
In the perspective of European-descendent theory, the degrees of any key or scale (major, minor, or modal) can be classified as follows: 1 - Tonic 2 - Supertonic 3 - Mediant 4 - Subdominant 5 - Dominant 6 - Submediant 7 - Leading Tone Let us take the case of C major as our key/scale: C - Tonic D - Supertonic E - Mediant F - Subdominant G - Dominant A - Submediant B - Leading Tone Similarily, this works in the minor keys, too. Using A natural harmonic as our key/scale: A - Tonic B - Supertonic C - Mediant D - Subdominant E - Dominant F - Submediant G - Leading Tone
To transpose from A major to C major, you need to shift each note up by a minor third interval, as C major is three half steps higher than A major. In A major, the notes are A, B, C#, D, E, F#, G#, and they become C, D, E, F, G, A, B in C major. Essentially, you can take each chord or melody in A major and move it up to the corresponding notes in C major to achieve the transposition.
The subdominant in any major scale is the fourth note. So, in C major, the subdominant is the F.
The subdominant note is D in an A major scale
The subdominant triad of Eb major is the Ab major triad.
The subdominant is the 4th note in a scale, so in A major it's D.
The subdominant note of E-flat minor is A-flat.
In a major scale the subdominant chord is a major chord,thus the dominant chord is major7.
The most common quality of the subdominant triad in a major key is major.
The subdominant is the 4th scale degree. In G major, that's C.
The subdominant is the 4th scale degree. In the key of C major, the subdominant is F.
C
F Major
The subdominant is usually the fourth scale degree of a major or minor scale.