At constant T and P, 5.0 L of $$SO_2$$ are reacted with 3.0 L of $$O_2$$ according to the following equation $$2SO_2 (g) + O_2 (g) \rightarrow 2SO_3 (g)$$.
The volume of the reaction mixture at the completion of the reaction is

A

0.5 L

B

8.0 L

C

5.5 L

D

5 L