Which of the Following Enabled Fifteenth-Century

Which of the following enabled fifteenth-century

A) European rulers amassed enough wealth to finance the risky and expensive voyage.
B) European mariners figured out the wind patterns that govern the Atlantic and Pacific.
C) Ship builders in the Americas designed and constructed ships capable of making the difficult journey.
D) Climatic changes made it safer to travel the Atlantic and Pacific in the fifteenth century C.E.