HELP HURRRRYYY
Which of the following chemical equations is unbalanced?
A. CH4 + 2O2 CO2 + 2H2O
B. 3Mg + Mn2O3 3MgO + Mn
C. AgNO3 + LiOH AgOH + LiNO3
D. 2NaOH + H2SO4 Na2SO4 + 2H2O