Each of the Following Groups Contains One Correct Sentence

Multiple Choice

Each of the following groups contains one correct sentence. Select the correct sentence from each group. Which sentence is correct?

A) Ms. Forsythe's employer installed a telephone in her car so he could always reach her; but, she rarely answers the ring.
B) Ms. Forsythe's employer installed a telephone in her car so he could always reach her, however she rarely answers the ring.
C) Ms. Forsythe's employer installed a telephone in her car so he could always reach her, but she rarely answers the ring.