A.I. Explanation:

Option 1: "Promoting healthy lifestyles and sustainable living"

Explanation: The text clearly states that community gardens play a critical role in promoting healthy lifestyles and sustainable urban living. This aligns directly with the main idea of the text, which emphasizes the benefits of community gardens in fostering a sense of community and environmental responsibility.

Option 2: "Decreasing urban population"

Explanation: This option is incorrect because the text does not mention anything about the urban population decreasing. Instead, it focuses on the positive contributions of community gardens to urban environments.

Option 3: "Increasing reliance on imported food"

Explanation: This option contradicts the text, which highlights that community gardens contribute to food security by allowing residents to grow their own food, thereby reducing reliance on imported food.

Option 4: "Reducing the need for public parks"

Explanation: This option is incorrect as the text does not suggest that community gardens reduce the need for public parks. Instead, it emphasizes the aesthetic appeal and educational opportunities provided by community gardens, which complement rather than replace public parks.