Which of the following are oxidation-reduction reactions?
I. PCl3 + Cl2 → PCl5
II. Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
III. CO2 + 2LiOH → Li2CO3 + H2O
IV. FeCl2 + 2NaOH → Fe(OH)2 + 2NaCl
A. I, II, III, and IV
B. I, II, and III
D. I and II
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