Answer:
a ) the cello is a difficult instrument to play
Explanation:
A. A cellist must learn accurate finger placement by ear and practice for several hours daily.
B. The cello has four strings that lie across the bridge piece; it does not have marked frets.
C. The cello is a string instrument, like a violin, and plays mostly on the bass clef of the music staff.
D. YoYo Ma is a famous modern cellist, and his collaborations with popular artists have helped revive interest in the cello.
It should be C) Make the verb tenses consistent. "Develop" should be developing, so that it is consistent and parallel with performing and studying.
