The columbian exchange was based on interactions between the old world and
a. the americas
b. europe
c. asia
d. africa

The Columbian Exchange was based on interactions between the Old World and:

A. The Americas

The Columbian Exchange was the exchange of plants, animals, disease, and culture between the Americas and the Old World. The exchange began with Christopher Columbus' arrival to the New World and influenced, diffused and changed many cultural aspects of both Europe and America. Some of the exchanges were cocoa, spices, cotton and smallpox.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.