“It brought the potato, the pineapple, the turkey, dahlias, sunflowers, magnolias, maize, chili and chocolate across the Atlantic. On the other hand, tens of millions died in pandemics of the 16th century, victims of smallpox, measles, and other disease brought by Europeans (and don’t forget that the African slave trade was begun by the Europeans, to replace the work force they had decimated)” -Michael Wood, BBC History (adapted)

The statement above refers to which one of the events listed below?
a
Commercial Revolution
b
Glorious Revolution 
c
Creation of the Hanseatic League
d
Columbian Exchange