The D7 note is the V7 chord for the scale shown.
What is the V7 chord?
Basically, the letter 'v’ means a chord built from the fifth note of the scale.
The V7 Chord is a dominant chord, it is based on the fifth degree of a scale and are indicated with the Roman numeral “V”.
Hence, the D7 note is the fifth note of the scale shown.
Therefore, the Option B is correct.
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