Answer:
A.The search for gold which often remained undiscovered
Step-by-step explanation:
The Spanish sponspored continous exploration of the Americas having noticed the abundant pressence of gold and precious metals who were highly estimated in European contexts.
The gold was used as the international currency of the time , and used mainly for having debt that often went for the case of Spanish religious wars.
An incredible quantity of gold gave way to legends like "El Dorado" which quickly spread through whole Europeans and favored more nations coming into exploring. The legends like "El Dorado" depic a city full of gold taught to be located somewhere in Central America.
Many explorers, and people looking for adventures believed this and perished often , while others left some records.
Still Americas was rich in gold and eventually the metal began to increase the Spanish crown that was to become a major power.