Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R) :
Assertion (A) : Robert Nozick illustrated negative liberty in his writings.
Reason (R) : According to Robert Nozick, the primary threat to liberty is the imposition of obligation to which one has not consented.
In the light of the above statements, choose the most appropriate answer from the options given below :