Choose the best revision:
Amy, who spent many hours practicing, became an accomplished musician and performed at many concerts.
A.By practicing many hours, Amy became an accomplished musician and performed at many concerts.
B.By practicing to perform at many concerts, Amy spent many hours becoming an accomplished musician.
C.By practicing to become an accomplished musician, Amy spent many hours practicing and performing at many concerts.
D.By practicing and spending many hours doing so, Amy became an accomplished musician and performed at many concerts.
What is A. By practicing many hours, Amy became an accomplished musician and performed at many concerts.