During the postclassical era, empires grew to larger sizes than they had in the past. which of these factors contributed to this trend?
a. growth of the roman empire
b. development of industrial manufacturing
c. expansion of trade routes
d. spread of democratic governments

The answer is C for apex

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.