Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

A

$$3S+2H_{2}SO_{4} \rightarrow 3SO_{2}+2H_{2}O$$

B

$$C+2H_{2}SO_{4} \rightarrow CO_{2} + 2SO_2 +2H_{2}O$$

C

$$CaF_{2}+H_{2}SO_{4} \rightarrow CaSO_{4}+2HF$$

D

$$Cu+2H_{2}SO_{4} \rightarrow CuSO_{4}+SO_{2}+2H_{2}O$$