Which solution will form a precipitate when mixed with a solution of aqueous ba(no3)2?

Which solution will form a precipitate when mixed with a
solution of aqueous Ba(NO3)2 ? a) CuCl2 (aq) b) K2SO4 (aq) c) NaBr (aq) d) NH4Cl (aq)

b) K2SO4 (aq)

reactivity order
b)
K2SO4

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