The direct conversion of A to B is difficult, hence it is carried out by the following shown path
Given `DeltaS_((ArarrC))=50 e.u.`
`DeltaS_((CrarrD))=30 e.u.`
`DeltaS_((BrarrD))=20 e.u.`
where e.u. is entropy unit then `DeltaS_((ArarrB))`
A. `+ 100 e.u.`
B. `+ 60 e.u.`
C. `- 100 e.u.`
D. `- 60 e.u.`