by Columbus in 1492,the island, or at least the western part of it now known as Haiti, was

    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