For the given compound, % s character of phosphorous hybrid orbitals which contribute to various bonds are given in the table below.

This difference in % s character of various phosphorous bonds could be due to

A

The large size of bromine atom

B

The large electronegativity difference between P and O

C

Increased overlap of $$\sigma$$-orbitals of terminal P-O bond

D

Stronger covalent character of P-O in cyclic oxygen atoms