The balanced equation is AgNO3 + NaCl --> AgCl + NaNO3. No coefficients are needed because everything bonds in a 1:1 molar ratio.
(C) AgNO3 + NaCl --> AgCl + NaNO3
No. It must have the same number of each as reactants and products. AgNO3(aq) + NaCl(aq) -> AgCl(aq) + NaNO3(aq)