If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water ($\Delta T_f$), when 0.01 mol of sodium sulphate is dissolved in 1 kg of water, is $(K_f = 1.86\; K\; kg\; mol^{–1})$

Question

( A ) 0.0186 K
( B ) 0.0558 K
( C ) 0.0744 K
( D ) 0.0372 K