Consider the following reactions (i) LiOH + CO_2 ⟶ Li2CO3 + H2O (ii) 2H2 + O2 ⟶ 2H2O (iii) 2Cu + O2 ⟶ 2CuO (iv) HCl + AgNO3 ⟶ AgCl + HNO3 Which of these reactions are redox reactions?

• A.(i) and (iii) only
• B.(i), (ii) and (iii) only
• C.(ii) and (iv) only
• D.(ii) and (iii) only