Which of the following chemical reactions depicts the oxidizing behaviour of $H_2SO_4$ ?

Question

( A ) $NaCl + H_2SO_4 \to NaHSO_4 + HCl$
( B ) $Ca(OH)_2 + H_2SO_4 \to CaSO_4 + 2H_2O$
( C ) $2PCl_5 + H_2SO_4 \to 2 POCl_3 + 2 HCl + SO_2Cl_2$
( D ) $2HI + H_2SO_4 \to I_2 + SO_2 + 2H_2O$