Which of the following statements does not support the liberty tree metaphor?

a. liberty requires many people to believe in a uniting principle, as a tree has many branches that make up its structure.
b. liberty is unconquerable and need not fight for its existence, like a tree.
c. liberty is a foundation for living within a free society, as roots are a foundation for trees to grow.
d. liberty has the potential to become more powerful with time, as a tree has the potential to grow taller and thicker with time.