A 0.0020 M aqueous solution of an ionic compound $Co(NH_3)_5(NO_2)Cl $ freezes at $- 0.00732^ºC$. Number of moles of ions which 1 mole of ionic compound produces on being dissolved in water will be : ($k_f = 1.86^ºC/m$)

Question

( A ) 3
( B ) 1
( C ) 2
( D ) 4