As a result, society is improved. It is easier for people to solve problems when they are more educated. Increasing the diversity of the workforce. As technology advances, the workforce shifts as well. Boost to the economy. There is a massive amount of debt that students whom are not able to afford them either graduate with debt or are not able to graduate at all. It also Focuses more on equality.
It helps develop the theme because with the teacher being strict Kevin no longer tries to get answers from his father and listens to the teacher and Kevin learns from it.
I would go with D, as Non-fiction isn't locked to politics or science; It's moreover use to categorize literature (books, etc...) that are based solely on fact.