With Their Capital at Mexico City, the Spanish Apparently Concluded

With their capital at Mexico City, the Spanish apparently concluded that

A) they had a good opportunity to explore all of Mexico from east to west.
B) they would probably be able to subdue the Amerindian groups of Patagonia in South America.
C) they had complete ownership of al the gold and silver that was to be found in today's American southwest.
D) the forts of San Francisco and Santa Fe were as far away as they cared to rule.
E) any gold inside Mapuche territory would not be worth fighting that group so far from Spanish headquarters.