I understood why D is wrong, but shouldnt A be the correct ans for this qsn? pls explain the ans...

Dear Student,
Tetrahedral complexes may or may not show optical isomerism.
Ma4 type tetrahedral complexes do not optical isomerism due to presence of symmetry but Mabcd type complexes can show optical isomerism due to absence of symmetry. Hence option A is not always correct.
Regards,
 

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