【单选题】

A main purpose of the passage is to
A．(A) chronicle the evolution of Nahua survivalist strategies from the year 1521 onward

B．(B) critically evaluate the means of Nahua survival on the basis of their efficacy
C．(C) suggest that Nahua interacted with their conquerors to create new technologies
D．(D) explore the rich cultural heritage endowed the Nahua by their tradition of survival
E．(E) apply a general schema for cultural survival to the case of the Nahua