Upon Mixing a Clear Colorless BaCl₂ Solution with a Clear,colorless

Upon mixing a clear colorless BaCl₂ solution with a clear,colorless Na₂SO₄ solution according to the reaction below,a student observes a white cloudiness form.What is responsible for the cloudiness that is observed? BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaCl(aq)

A) NaCl
B) BaSO₄
C) BaCl₂
D) Na₂SO₄
E) It is impossible to tell without doing the reaction oneself.