When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depress

When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :
A. `Pb(CN)_(2)` is precipitated while no effect on ZnS
B. ZnS forms soluble complex `Na_(2)[Zn(CN)_(4)]`
C. PbS forms soluble complex `Na_(2)[Pb(CN)_(4)]`
D. They cannot be separated by adding NaCN

When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

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