Uniqueness of the Diatonic Dominant Seventh
Which of the following explains why the diatonic seventh chord built on the fifth scale degree is unique in a major key?
A
It’s the sole fully diminished seventh chord, comprising all minor thirds
B
It’s the exclusive augmented major seventh chord, featuring an augmented triad base
C
It’s the only dominant seventh chord, containing a major triad and a minor seventh
D
It’s the only minor-major seventh chord, combining a minor triad with a major seventh
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