Which among the following equation is related to diffusional mixing in liquid (during steady state)? (Where D, Cl, Cs, v represents the diffusivity in liquids, solute concentration of liquid and solid, constant rate and Cl’=dCl/dx respectively)

• A. –DCl = v(Cl-Cs)
• B. DCl = (Cl-Cs)/v
• C. DCl = Cs-Cl/v
• D. DCl = v (Cl-Cs)
• E. ? (Where D, Cl, Cs, v represents the diffusivity in liquids, solute concentration of liquid and solid, constant rate and Cl’=dCl/dx respectively)a) –DCl = v(Cl-Cs)b) DCl = (Cl-Cs)/vc) DCl = Cs-Cl/vd) DCl = v (Cl-Cs)