Voluntary unemployment signifies an individual's decision to remain jobless despite being able to work and the availability of employment at the current wage, driven by factors like personal choices, discontent with existing jobs, or anticipation of better remuneration. Full employment equilibrium describes a condition where every willing and capable individual is employed, with only voluntary unemployment present. At this point, involuntary unemployment is non-existent, meaning any person seeking employment at the established wage can secure a position. Conclusion: Although both assertions hold validity, the Reason (R) does not directly elucidate the Assertion (A), thus option (B) is appropriate.