He was exhausted after a long trip. However, 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.