Given the reaction: 2 Fe + 3 Cl₂ → 2 FeCl₃, calculate the change in oxidation number for iron and determine if it is oxidized or reduced.

• A. Iron's oxidation number remains unchanged, indicating no redox reaction.
• B. Iron's oxidation number changes from +3 to 0, indicating it is reduced.
• C. Iron's oxidation number changes from 0 to -3, indicating it is reduced.
• D. Iron's oxidation number changes from 0 to +3, indicating it is oxidized.

Answer: (D)