(d) Opportunity to develop oneself fully
Historically speaking, the term liberty was initially defined as absence of all restraints on an individual. This is known as the negative concept of liberty. Early liberalism championed negative liberty. John Stuart Mill, the nineteenth century English political philosopher, described, "Restraint as an evil".
So, (d) is appropriate.
However, after the examination, many of the coaching classes felt that answer should be "b" based on another interpretation by D.D. Basu.