A.I. Explanation:

Option 1: "Increasing urban pollution"

Explanation: This option contradicts the text, which states that urban green spaces improve air quality and contribute to a healthier environment. Therefore, it cannot be correct as it presents information that is not supported by the text.

Option 2: "Reducing biodiversity"

Explanation: The text explicitly mentions that green spaces support biodiversity by providing habitats for various species. Thus, this option is incorrect as it presents a statement that directly contradicts the information provided in the text.

Option 3: "Enhancing residents' mental health"

Explanation: The text states that urban green spaces have a positive impact on mental health, reducing stress and enhancing mood among residents. This aligns perfectly with the question, making it the correct answer.

Option 4: "Decreasing recreational areas"

Explanation: This option is incorrect because the text highlights that green spaces provide areas for recreation and relaxation. Therefore, stating that they decrease recreational areas contradicts the information presented in the text.