The correct sequence showing the increasing concentration of gases is Ozone, Carbon dioxide, Oxygen and Nitrogen. Ozone exists only in trace amounts, while carbon dioxide makes up about 0.04% of the atmosphere. Oxygen is much more abundant at 21% and nitrogen is the most prevalent gas at 78%. This specific hierarchy reflects the fundamental chemical composition of our planet’s air today. ANSWER: (C) Ozone, Carbon dioxide, Oxygen, Nitrogen