The correct answer is D. Popular sovereignty
Explanation:
Popular sovereignty is a political doctrine in which government and other political and administrative decisions derive from citizens. This usually implies citizens elect representatives and have a great influence on politics.
This principle is the one people lack in the passage because the author describes people who cannot manage public affairs "has kept us in a sort of permanent infancy with regard to public affairs". This means people are not deciding over government or internal administration and therefore there is no popular sovereignty.
Answer:
creating time for reading when less busy
