The correct option is
C ΔtotalS=0⇒ Entropy change in spontaneous process :
ΔSSystem+ΔSsurrounding≥0
The sign > is for spontaneous process. A state of equilibrium in a close system is attained spontaneously.
As system approaches equilibrium from non - equilibrium state −STotal Keeps on increasing at equilibrium
STotal attains its maximum value.
⇒ΔSTotal=0 at equilibrium
at this point STotal= maximum value at equilibrium in a close system.