D is the ii, E is the iii, and so on until you come back to C which is the VIII, or the octave. Each chord associated with the scale degree is either major, minor, half-diminished or dominant.

All the chords built on other notes in the scale of C are minor, except chord VII - the notes B – D – F, which is diminished. When a seventh is added to a chord this is known as a seventh chord.

All the chords built on other notes in the scale of C are minor, except chord VII - the notes B – D – F, which is diminished. When a seventh is added to a chord this is known as a seventh chord.