What was the impact of this process on Europe?

(A) The population increased due to the increased diversity of crops. (B) The population declined as a result of imported disease. (C) The population increased due to New World immigrants. (D) The population declined because of famine caused by the mass export of crops.Explanation: Increased diversity of crops meant a greater and more varied food supply, which in turn led to increased population in Europe. There is some speculation regarding whether any diseases entered Europe via the Columbian Exchange, but, in any event, such introductions were not sufficient to cause any significant decline in the European population (B). Immigration from the Americas to Europe was not a widespread phenomenon (C). Though Europeans brought crops to the Americas, it was not in quantities that would have caused a famine or a population decrease (D).