Option 3 because its dissociation constant will be max.
-3
Al Ameen answered this
now every solution has 1 molar concentration, so here the value depend on van't hoff factor(i).
1)glucose being non electrolye ,i=1
2)KCL i=2
3)AL NO3, I=4
4) NA2 SO4 I=3
SO ANSWER IS 3