The type of work done by the people
The answer is A. "That among these are Life, Liberty, and the Pursuit of Happiness".
"The three natural rights that Jefferson identified in the Declaration of Independence: 'Life, Liberty, and the Pursuit of Happiness.'" (www.crf-usa.org)
If you're with K12, the answer should be in the lessons.
There you go, hope that helps!
Nothing has so far been proven.