The Following Questions Refer to the Excerpt Below

The following questions refer to the excerpt below.
"It is a heavily populated land. We asked why they did not sow maize;they replied that they were not doing so in order not to lose the crop,for during two consecutive years the rains had failed and the weather had been so dry that all had lost their whole crop of maize,and they did not dare sow it again until there had been copious rain. And they begged us to tell the heavens to rain,and implore them to do so,and we promised that we would do this. We also asked them from where they had brought [the maize they had],and they said from the direction the sun had set,and in all that land there was maize everywhere."
-This passage by de Vaca reflects which of the following?

A) European exploration of the Americas was fueled by desire for wealth.
B) New crops from Europe stimulated native cultures immediately after the Encounter.
C) Technological improvements introduced by Europeans produced changes to Native American economies.
D) The spread of maize culture in North America, which had occurred prior to the Encounter.