The statement that best analyzes how the cartaz system represented a departure from previous patterns of trade is:
Portuguese ports now had exclusive control of Indian Ocean trade.
The cartaz system was a permitting system established by the Portuguese that required foreign traders to obtain a pass (cartaz) in order to trade in the Indian Ocean. This system allowed the Portuguese to establish a level of control over maritime trade routes and represented a shift from earlier, more fragmented trade practices where multiple powers engaged in trade without such a formalized regulatory structure.