In Treasure Island, how is the central conflict of the novel resolved?A. Jim Hawkins helps Long John Silver and Captain Smollett to treat Ben...

There are elements of truth in each of the options, but C is the only correct answer.

While Ben Gunn hints to Jim that he has already found the treasure, claiming that he's rich, Jim doesn't catch on to this at the time. Because Jim left the stockade to recover and beach the Hispaniola, he wasn't present to learn Dr. Livesey negotiated with Ben Gunn to relocate the stockade group to Gunn's cave, where Gunn had already recovered and stored the treasure. Jim spends most of the remainder of the story confused as to why the stockade was abandoned to the pirates, and the treasure map given to Silver. 

With the exception of Silver, who negotiated with Jim and Dr. Livesey to spare himself, the remaining pirates are marooned on the island, though not without provisions left behind by the doctor. Because most of the original crew is dead, the Hispaniola needs replacements before it can attempt crossing the ocean back to England, and so it travels to the nearest port in the Americas. While there, Silver escapes, and thereby avoids punishment.