It seems like people could still migrate, while still having a steady population. For example a bunch of people move as a result of climate, but that same change in climate influenced an equal number of people from other places to migrate to that same place.
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Great question. I think you may be misreading what (C) is saying.
(C) says, "A population remains settled only where the climate is fairly stable."
(C) is basically the contrapositive of one of the conditions that we were given in the stimulus: "drastic shifts in climate always result in migrations." The contrapositive of this is if there's no migration (population remains settled), then there was no drastic shift in climate (climate is fairly stable). This is why (C) is the most strongly supported answer choice, as it's essentially restating one of the conditions we were given in the stimulus.
Does this make sense? Let us know if you have any more questions!
