According to the Authors, What Was Probably the Most Impressive

According to the authors, what was probably the most impressive Spanish venture in exploration?

A) Columbus's discovery of the New World.
B) Hernán Cortés's subjugation of the Aztecs.
C) The exploration of Florida, California, and Arizona.
D) Magellan's circumnavigation of the globe.
E) Gaining control of all of Central America.