In 1926, in her second attempt to swim across the English Channel, Gertrude Ederle
not only crossed the Channel against currents that forced her to swim thirty-five miles
instead of the minimal twenty-one, but she set a record for speed as well, by
swimming the distance in almost two hours faster than anyone had yet done.
A. but she set a record for speed as well, by swimming the distance in almost two hours
faster than anyone had yet done.
B. but also set a record for speed, swimming the distance almost two hours faster than
anyone had yet done.
C. but also swam the distance in almost two hours faster than anyone had yet done, and
setting a record for speed.
D. but also setting a record for speed by swimming the distance in almost two hours
faster than anyone had yet done.
E. but, she also set a record for speed, swimming the distance almost two hours faster than anyone had yet done,

My question is what is wrong with E