Which of these corrects the inappropriate shift in mood in the following sentence? she had learned to play the piano in one month, and was that not a great accomplishment? a. had she learned to play the piano in one month, you will think of it as a great accomplishment. b. she had learned to play the piano in one month, and that was a great accomplishment. c. she had learned to play the piano in one month, and if you want, it is a great accomplishment. d. if she had learned to play the piano in one month, you must think of it as a great accomplishment.