Conversion of A to B is carried out by the following process: $\Delta S(A\rightarrow C)=50eV, \Delta S(C\rightarrow B)=30eV, \Delta S(B\rightarrow D) = 20 eV$, where eV, where eV, is entropy unit, then $\Delta S(A\rightarrow B)$ is

Question

(a) +100 eV
(b) +60 eV
(c) -100 eV
(d) -60 eV