In which of the following arrangements, the sequence is not strictly according to the property written against it ?
A. `CO_(2)ltSiO_(2)ltSnO_(2)ltPbO_(2)` : increasing oxidising power
B. `BltCltOltN : ` increasing first ionisation enthalpy
C. `NH_(3)ltPH_(3)ltAsH_(3)ltSbH_(3)`: increasing basic strength
D. `HFltHClltHBrltHI` : increasing acid strength