The correct answer is A) advanced navigation techniques and D) better cartography.
The two things that enabled the Portuguese to begin overseas exploration were advanced navigation techniques and better cartography.
Portugal played an important role in the European Age of Exploration and Discovery. Prince Henry, called “The Navigator” supported the exploration in the 15th century to find a route to Asia navigating through the South of Africa. Those sailings and adventures in the sea made them powerful and expert sailors. And with the help of advanced techniques and better cartography –more detailed maps- the Portuguese made important explorations and benefited of trade.
