Assuming this is from the book "The Call Of The Wild", Spitz is killed by Buck. Since Spitz has been killed, the sled drivers need a new leader, and Sol-Leks is chosed but Buck would not allow it.
I believe the answer is C
Dave was previously sick but wanted to keep running with the team. Despite his attempts, it's made clear he is too weak. A gunshot is heard after the rest of the dogs leave him behind
direct object would be the answer
i think it is a conjuction because it is definitly not a preposition