The most accurate response regarding what happened during the Columbian Exchange is:
Plants, animals, diseases, and people moved among continents.
The Columbian Exchange refers to the widespread transfer of plants, animals, culture, human populations, technology, diseases, and ideas between the Americas and the Old World (Europe, Africa, Asia) following Christopher Columbus's voyages in the late 15th century. This exchange had profound impacts on the societies involved, shaping economies, diets, and populations across the globe.