In the hydrides of the nitrogen group,the $H-M-H$ bond angle gradually approaches $90^o$ as we move from $N$ to $Sb$. This indicates that gradually.....

• A
  The basic character of the hydrides increases.
• B
  Almost pure $p$-orbitals are used in $M-H$ bonding.
• C
  The bond strength of the $M-H$ bond increases.
• D
  The bond pair of electrons moves closer to the central atom.