Which combination will produce a precipitate?

• A. NaOH (aq) and HCl (aq)
• B. KOH (aq) and Mg(NO3)2 (aq)
• C. NaC2H3O2(aq) and HCl (aq)
• D. AgNO3(aq) and Ca(C2H2O3) (aq)