Answer :
The technique of instrument of Earl Scruggs that Josh Graves took and applied on another instrument is the application of the banjo to the Dobro.
What is the Dobro technique?
This is a guitar technique that requires the player to use the right, left hand techniques and positions to play the dobro the correct way.
Hence, the dobro technique was the technique that Josh Graves applied the Dobro technique on.
Therefore, the Option D is correct
Read more about Dobro technique
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