Identify "all" the oxidation-reduction (redox) reactions?
I. PA + 3O2 → 2P2O3
II. 2HCl + 2Li → H2 + 2LiCl
III. Pb(NO3)2 + Na2S → PbS + 2NaNO3
A. I only
B. II only
C. III only
D. I and III