Option 1 includes some indicators of global climate change, such as rainfall and sea level, but it also includes oxygen and drought, which are not direct indicators of climate change. Oxygen levels can be influenced by various factors, including deforestation and pollution, but they are not directly linked to climate change. Drought is a weather phenomenon rather than a climate indicator, as it refers to extended periods of low precipitation in a specific area.
Option 2 includes some correct indicators, such as rising temperatures and sea level, but it also includes nitrogen, which is not a key indicator of global climate change. While nitrogen does play a role in the environment and can contribute to issues like eutrophication, it is not one of the key indicators of climate change.
Option 3 is the correct answer as it includes all five key indicators of global climate change: Arctic sea ice, carbon dioxide levels, global temperature, sea level, and land ice. These indicators are widely recognized by scientists as crucial indicators of climate change.
Therefore, the correct answer is option 3, and the other options either include irrelevant indicators or miss some important ones.