The correct answer is labor. Labor is work. When an employee completes work it is called labor.
Gabriel said to his son, "I can tell you are getting smarter because you can talk about things like democracy and freedom in a more philosophical way." basically, Gabriel is saying his son is capable of: abstract thinking. Abstract thinking focuses on reflecting events and ideas, and attributes and relationships separate from the objects that have those attributes or share those relationships.
D. filling important government positions with party supporters