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The passage does not state or imply that the Indian Ocean world's migration networks connected the global north with the global south. Option C is not true.
Option A is true : 'For much of history, travel by sea was much easier than by land, which meant that port cities very far apart were often more easily connected to each other than to much closer inland cities'
Option B, too, is true. The passage states that the Indian Ocean world references a different set of histories and geographies than the ones most commonly found in fiction in English, which 'assume a background of Christianity and whiteness, and mention places like Paris and New York'. The interconnected portcities of the global south feature a largely Islamic space and a cosmopolitan culture.
Option C is also true. On migration in the Indian Ocean world, the passage states 'Migration is often a matter of force; travel is portrayed as abandonment rather than adventure, freedoms are kept from women and slavery is rife.'
So, option C is the correct answer choice.