Consider the following molecules: $(I)$ $POF_3$,$(II)$ $SOF_4$,$(III)$ $IOF_5$. On moving from $(I)$ to $(III)$,which of the following changes is $NOT$ observed?

• A
  Number of $d-$orbitals involved in bonding: $(I)$ One $\to$ $(II)$ Two $\to$ $(III)$ Three
• B
  Number of orbitals involved in hybridization: $(I)$ Four $\to$ $(II)$ Five $\to$ $(III)$ Six
• C
  Number of $d\pi - p\pi$ bonds in the respective molecule: $(I)$ One $\to$ $(II)$ Two $\to$ $(III)$ Three
• D
  Number of lone pairs on the central atom: $(I)$ Zero $\to$ $(II)$ Zero $\to$ $(III)$ Zero