Why Was Spain's Wealth Acquired from the New World Considered

Why was Spain's wealth acquired from the New World considered to be a mixed blessing?

A) Spain was forced to send a large proportion of its population to the New World to help ship gold and silver back to Spain.
B) The Spanish got wealthy from silver and gold in the New World, but lost most of their army and navy in battles with Native Americans.
C) Because Spain used the New World only as a source of wealth, it did not consider establishing real settlements there.
D) Because Spain gained its wealth so quickly, it caused great inflation for ordinary Spaniards.
E) Most of the wealth ended up in the hands of Portuguese shippers.