Choose the best combination or properties for a good solvent for extraction out of the fu~~ ' (i) high selectivity (ii) low selectivity (iii) high viscosity (iv) low viscosity (v) large distribution coefficient (vi) small distribution coefficient (vii) high interfacial tension (viii) low interfacial tension

a. ( i ), ( iv ), ( v ), ( vii )

b. ( i ) , ( iii ), ( v ) , ( vi )

c . ( i ), ( iii ), ( v ), ( vii )

d. ( i ), ( ii ), ( iv ), ( vii )

The answer in this question is letter A. Please explain to me why letter A (a. ( i ), ( iv ), ( v ), ( vii )) is the answer. Thank you.