An Accurate Summary of the Achievements of European Explorers of the 16^th

An accurate summary of the achievements of European explorers of the 16^th century would include which of the following statements?

A) They proved that the most successful means of dealing with the Indians was through peaceful negotiations.
B) They managed to keep the religious influence of the Catholic Church out of their political maneuvering.
C) They set in motion a network of trade that would eventually include several continents.
D) They ultimately provided the Indians with the necessary tools to live a more productive life.