The writer is working on a new version of the passage and wants to include an explicit statement of the passage's thesis. Which of the following would best serve as a thesis statement for the passage?

a) Only our relationship with nature is truly free from any form of slavery, whether it be physical, mental, forced, or self-inflicted.
b) Nature confirms the ability for beauty to spring forth from death and decay; we simply need to let the slavery that plagues our society die.
c) Within nature we can find relationships symbolic of slavery; the flower needs the dirt as much as society needs slavery to thrive.
d) To truly appreciate the nature of man, one must go directly to nature, where lakes and flowers can reflect our potential for goodness.