In the reaction BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaCl (aq), what phases are the reactants in before the reaction?
Question 4 options:

A)

BaCl2 is a liquid, and Na2SO4 is a gas.

B)

BaCl2 is a solid, and Na2SO4 is in aqueous solution.

C)

Both reactants are gases.

D)

Both reactants are in aqueous solution.