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Identify the correct sentence:
A. Ms. Frasier’s employer installed a telephone in her car so he could always reach her; but, she rarely answers the ring.
B. Ms. Frasier’s employer installed a telephone in her car so he could always reach her, but she rarely answers the ring.
C. Ms. Frasier’s employer installed a telephone in her car so he could always reach her; but; she rarely answers the ring.
B. Ms. Frasier’s employer installed a telephone in her car so he could always reach her, but she rarely answers the ring.