Which one of the following pairs is isostructural (i.e. having the same shape and hybridization) ?

Question

( A ) $[NF_3 and BF_3]$
( B ) $[BCl_3 and BrCl_3]$
( C ) $[NH_3 and NO^{-}_3]$
( D ) $[BF^{-}_4 and NH_4 + ]$