Which of the following will give a pair of enantiomorphs:($en = NH_2 CH_2 CH_2 NH_2$)

Question

( A ) $[Co(en)_2Cl_2]Cl$
( B ) $[Cr(NH_3)_6][Co(CN)_6]$
( C ) $[Co(NH_3)_4Cl_2] NO_2$
( D ) $[Pt(NH_3)_4] [PtCl_6]$