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Dear student correct option is (a) K2 So4 because it is made from strong base base and strong acid ( Kcl + H2So4) which forms neutral solution because bother will ionise to same extent in water . But Na2 co3 is made of weak acid and strong base (HNo3 +NaOH) making basic solution because base will ionise more releasing -OH ions more and makes the solution basic . Similarly Nh4Cl made of weak base and strong acid (Nh3+HCl ) making solution acidic because here acid will ionise to more extent release more H+ ions . Cu(No3)2 is a made from strong base and weak acid making the solution basic when added in water . Regards

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