The social structure of the colonies was designed for the benefit of the upper class?

The gentry included wealthy planters, merchants, ministers, royal officials, and successful lawyers. Prosperous artisans, like goldsmiths, were often considered gentry as well. The gentry were few in number, but they were the most powerful people. Because members of high social classes tend to be better educated and have higher incomes, they are able to offer greater educational advantages, such as private schooling, to their children as well.

Explanation:

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.

b. the passage of the equal rights amendment  

explanation:

this mean that anything that someone else could do they could do