In which of the following arrangements,the sequence is not strictly according to the property written against it?

• A
  $CO_2 < SiO_2 < SnO_2 < PbO_2$ : increasing oxidising power
• B
  $NH_3 < PH_3 < AsH_3 < SbH_3$ : increasing basic strength
• C
  $HF < HCl < HBr < HI$ : increasing acid strength
• D
  $B < C < O < N$ : increasing first ionisation enthalpy