The subordinating subject is although
One trait Rainsford and General Zaroff have in common in the short story is their passion for hunting and their extensive knowledge in hunting. They both have traveled around the world hunting the most desired and exotic game and both have been doing it for a long time. Rainsford even wrote a book on hunting.
Once Rainsford accepts that he must participate in Zaroff's "game", Rainsford becomes much like Zaroff. He becomes a killer when he kills Zaroff's dog and then Ivan. ... Zaroff wants his prey to offer him as big a challenge as they possibly can. Zaroff sees the world divided between the strong and the weak.
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I am thinking the answer is b. C
