Which Breakthrough Helped Make Possible the European Voyages of Discovery

Multiple Choice

Which breakthrough helped make possible the European voyages of discovery in the fifteenth century?

A) The discovery that the world was round and not flat
B) The use of the caravel, a small three-masted ship
C) The invention of iron-plated ships that allowed European fleets to defeat their enemies
D) The use of the armada technique, in which many ships would sail simultaneously