Which revision would make the following sentence correct?
karen is a powerful singer, she always touches the men, women, and children who hear her.
a. karen is powerful singer; she always touches the men, women, and children who hear her.
b. karen is powerful singer, and she always touches the men, women, and children who hear her.
c. karen is powerful singer, always touches the men, women, and children who hear her.
d. all of the above