After the first weeks of school, anita's grades were not good, however, she studied hard and improved her grades during the next few weeks.
choose the answer that is the most effective substitute for the underlined part of the sentence. if no substitute is necessary, choose "leave as is."
a) leave as is.
b) anita's grades were not good however; she studied hard and improved
c) anita's grades were not good; however, she studied hard and improved
d) anita's grades were not good: however, she studied hard and improved