Answer:
Step-by-step explanation:
I would pick the idea in C, except for the fact that the raft going south is filled with irony. Jim is not heading to where he could claim freedom: he's heading in the wrong direction. He should be heading North, not South. South is the location of slavery. If C mentioned that fact, I would pick it.
Instead you have to pick a more mundane answer.
I suppose I would take D, but it is not nearly as important as C.