In which of the following reactions ozone acts as a reducting agent ?

Question

( A ) $2HCl + O_3 \to Cl_2 + H_2O + O_2$
( B ) $2KI + O_3 + H_2O \to 2KOH + I_2 + O_2$
( C ) $BaO_2 + O_3 \to BaO + 2O_2$
( D ) $PbS + 4O_3 \to PbSO_4 + 4O_2$