Pick out the isoelectronic structures from the following:
$\mathop {CH_3^+}\limits_{I}$ $\mathop {H_3O^{+}}\limits_{II}$ $\mathop {NH_3}\limits_{III}$ $\mathop {CH_3^-}\limits_{IV}$
$\mathop {CH_3^+}\limits_{I}$ $\mathop {H_3O^{+}}\limits_{II}$ $\mathop {NH_3}\limits_{III}$ $\mathop {CH_3^-}\limits_{IV}$
- A$I$ and $II$
- B$I$ and $IV$
- C$I$ and $III$
- D$II, III$ and $IV$
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