Which new world crops added the most calories to european diets and therefore positively impacted sustainable population numbers?
a. wheat and potatoes
b. potatoes and maize
c. maize and beans
d. tomatoes and peppers

The New World crops that added the most calories to European diets and therefore positively impacted sustainable population numbers were "b. Potatoes and maize," since these were the most abundant and had the most nutritional benefits. 

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