Which of the following does not show optical isomerism - (en = Ethylenediamine)

1. A. [ Co(en) 3 ] 3+
2. B. [ Co(en) 2Cl 2 ] +
3. C. [ Co(NH 3) 3Cl 3 ] 0
4. D. [ Co(en)Cl 2(NH 3) 2 ] +

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