Answer: D
Justification: Liberty can be seen from two perspectives – negative and positive.
Negative liberty is the absence of obstacles, barriers or constraints. Positive liberty is the possibility of acting — or the fact of acting — in such a way as to take control of one’s life and realize one’s fundamental purposes. One may surmise that the purpose of ensuring that one has no obstacles is to realize one’s full potential.
Therefore, option B only covers part of the definition of liberty, whereas option D covers it fully. Option A is also a partial definition and has a connotation more towards fundamental rights rather than liberty. One can be protected from tyranny by rule of law,
but that does not by itself guarantee liberty.
See
https://plato.stanford.edu/entries/liberty-positive-negative/