A mixture of methane gas, \(\text{CH}_4\text{(g)}\), and oxygen gas, \(\text{O}_2\text{(g)}\), is placed in a rigid closed vessel as represented in the diagram.

\[ \text{CH}_4\text{(g)} + 2\text{ O}_2\text{(g)} \rightarrow \text{CO}_2\text{(g)} + 2\text{ H}_2\text{O(g)} \]

The mixture is ignited and the reaction proceeds to completion. Which of the following particulate diagrams best represents the contents of the vessel after the reaction is complete?