A.I. Explanation:

Option 1: "They increase the cost of urban living"

Explanation: This option is incorrect because the text does not mention anything about urban green spaces increasing living costs. Instead, it highlights the benefits of green spaces, such as health improvements and biodiversity, which do not imply any increase in costs.

Option 2: "They reduce the availability of residential areas"

Explanation: This option is incorrect as the text does not state that urban green spaces reduce residential areas. In fact, it emphasizes the positive aspects of green spaces, such as promoting health and biodiversity, without suggesting any negative impact on housing availability.

Option 3: "They contribute to improved mental and physical health"

Explanation: This option is correct because the text explicitly states that urban green spaces provide opportunities for physical activity, relaxation, and social interaction, all of which contribute to improved mental and physical health. This aligns directly with the main idea of the text regarding the benefits of green spaces.

Option 4: "They solely focus on providing entertainment"

Explanation: This option is incorrect because the text indicates that urban green spaces offer a variety of benefits beyond entertainment, including health improvements and biodiversity enhancement. The use of 'solely' implies an exclusive focus, which contradicts the broader benefits outlined in the text.