What did the court case McCulloch v. Maryland prove?

How is this passage an example of an internal conflict? o o aught now! the first quite hat. a ckle unds djust track. 1 e sour it describes the narrator's inability to stop playing when she wants to do so. it describes the narrator's unexpected enjoyment of performing in front of an audience. it describes the narrator's thoughts and feelings as she struggles through a poor performance. it describes the results of the narrator's refusal to practice diligently and learn to play the piano correctly. o o