What type of gas stays in the middle of an enclosed space? A Carbon Monoxide B Carbon Dioxide C Oxygen c D Methane

The question is asking about the behavior of different gases in an enclosed space. The options provided are Carbon Monoxide, Carbon Dioxide, Oxygen, and Methane.

The behavior of gases in an enclosed space is determined by their density relative to the surrounding air. The gas that stays in the middle of an enclosed space is the one that has a density close to that of air.

Among the options provided, Oxygen has a density closest to that of air, making it the most likely to stay in the middle of an enclosed space. Therefore, the correct answer is C, Oxygen.