______by Columbus in 1492,the island, or at least the western part of it now known as Haiti, was the scene of some of the most advanced political developments in the western world_________the eighteenth century, whose success_________the labor of half a million slaves
A．Discovered ; well in; rested on
B．Discovered; late; relying on
C．Discovering; well in; counting on
D．Discovering; lately ;depends on