Choose the phrase that best completes the sentence.
He was exhausted after a long trip, but he helped me to repair my broken chair.
A.Although he helped me to repair my broken chair, he was exhausted after a long trip.
B.Exhausted after a long trip as he was, he helped me to repair my broken chair
C.Because he helped me to repair my broken chair after a long trip, he was exhausted.
D.Exhausted after a long trip though he helped me to repair my broken chair.