Which of the following complexes will show optical activity?
- A$[\mathrm{Co(NH_3)_4Cl_2}]^+$
- B$[\mathrm{Cr(H_2O)_6}]^{3+}$
- C$\mathrm{cis-[Co(NH_3)_2(en)_2]^{3+}}$
- D$\mathrm{trans-[Co(NH_3)_2(en)_2]^{3+}}$
✓ Correct answer: C
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