United States History Question of the Day

Spaniard Cortes being greeted by Aztec emperor Montezuma
(Source: Wikimedia Commons)
Question 0920:
One of the factors that proved critical
to the Spanish conquest of the Aztecs was
(A) the overwhelming number of Spanish
soldiers
(B) the total lack of organization of
the Aztec political and military system
(C) the support of Portuguese soldiers
(D) the pacifist nature of the Aztecs
(E) a smallpox epidemic spread by
contact with the Spanish soldiers