Consider the following species

A) $\stackrel{⊝}{\mathrm{C}}{\mathrm{H}}_3$

B) ${\mathrm{NH}}_4^{+}$

C) ${\mathrm{H}}_3{\mathrm{O}}^{+}$

D) ${\mathrm{SiF}}_6^{-2}$

E) ${\mathrm{SO}}_3^{-2}$

The species having regular geometry is / are

$\stackrel{-}{\mathrm{C}}{\mathrm{H}}_3$   .   .   .   .3 bp + 1 lp   .   .   .   Pyramidal   .   .   .   distorted

${\mathrm{NH}}_4^{+}$   .   .   .   .4 bp + 0 lp   .   .   .   tetrahedral   .   .   . regular

${\mathrm{H}}_3{\mathrm{O}}^{+}$   .   .   .  3 bp + 1 lp   .   .   .   Pyramidal   .   .      distorted

${\mathrm{SiF}}_6^{-2}$   .   .   .  6 bp + 0 lp   .   .   .   octahedral   .   .   . regular

${\mathrm{SO}}_3^{-2}$   .   .   .  3 bp + 1 lp   .   .   .   Pyramidal   .   .   .  distorted