Identify the correct order of the size of the following:

1. A. Ca 2+ < K+ < Ar < Cl - < S 2-
2. B. Ar < Ca 2+ < K+ < Cl - < S 2-
3. C. Ca 2+ < Ar < K+ < Cl - < S 2-
4. D. Ca 2+ < K+ < Ar < S 2- < Cl -

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