Which of the Following Strategies Is LEAST Beneficial for Shuyler's

Which of the following strategies is LEAST beneficial for Shuyler's parents to use to get Shuyler to play the violin?

A) Provide small extrinsic rewards when he first begins his violin lessons.
B) Praise him often for making the effort to practice.
C) Reward his practice efforts even when done poorly or without enthusiasm.
D) Encourage Shuyler to focus on how playing the violin is personally rewarding.