Conductivity (Seimen's S) is directly proportional to area of the vessel and the concentration of the soluion in it and is inversely proportional to the length of the vessel, then constant of proportionality is expressed in :

Question

( A ) $S^2 \; m^2\; mol^{-2}$
( B ) $S^2 \; m^2\; mol$
( C ) $S \; m^2 \; mol^{-1}$
( D ) $S \; m\; mol^{-1}$